FREEMEDSITE MRCS ACADEMY · ARTICLE 21 · COMMON SURGICAL CONDITIONS

Common Surgical Specialty Presentations Made Easy for MRCS Part A

Recognise common vascular, breast, endocrine, urological, orthopaedic, head-and-neck and paediatric surgical presentations. Learn when to refer, investigate or intervene urgently. Study 12 modules, track 52 topics and practise 40 original five-option clinical SBAs.

12Teaching modules

52Saved objectives

40Original SBAs

MRCS Part A · Paper 2Specialty red flags40 original clinical SBAsSaved locally in your browser

Learn → apply → test. Read the modules, tick each topic once understood, answer one question at a time, check your answer and read the explanation. All progress is saved on this device without a login.

Who should use this guide?

Doctors beginning MRCS Part A, trainees revising common surgical presentations and educators teaching clinical decision-making. The material is designed to complement the official published syllabus. The questions are original educational cases, not reproduced confidential exam questions or unverified answer keys.

Clinical safety: These examples simplify complex decisions for examination teaching. Follow contemporary local pathways and escalate real patients appropriately.

On this page

1. The first 60 seconds: triage before diagnosis2. Peripheral arterial disease, claudication and threatened limbs3. Venous disease: DVT, varicose veins and ulcers4. Breast lump, nipple discharge, mastitis and abscess5. Thyroid nodules, endocrine neck masses and parathyroid disease6. Urology: retention, haematuria and obstructed infection7. Orthopaedic presentations: hot joint, fracture and limb danger8. ENT, head and neck: persistent lumps and airway threats9. Skin, soft tissue, melanoma and necrotising infection10. Paediatric surgical presentations and red flags11. Neurosurgical and spine surgical emergencies12. MRCS decision framework: choose the next best step52-topic saved revision checklist40 original specialty clinical SBAsFrequently asked questionsReferences and the MRCS Academy

1. The first 60 seconds: triage before diagnosis

Across specialties, sort the presenting complaint into an immediate threat, an urgent same-day assessment or a planned diagnostic pathway. Shock, threatened limb, testicular torsion, septic arthritis, sepsis with urinary obstruction and acute compartment syndrome are not routine outpatient presentations.

History and examination still matter: note onset, progression, pain severity, neurovascular status, constitutional symptoms, medication/anticoagulation, age and cancer risk. Order tests only if they answer a decision. Never allow an investigation to delay essential resuscitation or urgent surgical review.

Three questions: Is tissue viability threatened? Is infection requiring drainage/source control possible? Could a malignancy need an expedited diagnostic pathway?

Original teaching schematic: urgency is determined by physiology and risk of irreversible injury.

2. Peripheral arterial disease, claudication and threatened limbs

Intermittent claudication is exertional muscle discomfort relieved by rest. Chronic limb-threatening ischaemia involves chronic ischaemic rest pain or tissue loss with objective arterial disease. A sudden painful, pale or insensate limb suggests acute limb ischaemia (ALI); examine motor and sensory function, capillary refill, limb temperature and arterial Doppler signals, and seek immediate vascular input. Classify ALI using the Rutherford scheme, where motor deficit implies an immediately threatened limb and urgency of revascularisation.

For stable suspected PAD, take a vascular history, examine pulses, measure ankle-brachial pressure index (ABPI) and address smoking, cardiovascular risk, statin/antiplatelet suitability and supervised exercise. In diabetes, calcified non-compressible arteries may falsely elevate ABPI; toe pressure/waveform assessment may be needed. Do not use a normal/high ABPI alone to exclude PAD in diabetes.

References: NICE CG147; ESVS acute limb ischaemia.

3. Venous disease: DVT, varicose veins and ulcers

A painful swollen calf has many causes, including DVT, cellulitis, ruptured Baker cyst and injury. Use a validated DVT Wells score and the appropriate NICE diagnostic pathway rather than relying on Homan sign. With likely DVT, proximal leg vein ultrasound is indicated; if scanning is delayed, follow current interim anticoagulation and follow-up imaging guidance after considering bleeding risk.

Varicose veins with symptoms, skin change, bleeding, superficial thrombosis or ulceration need vascular assessment. A venous ulcer usually involves the gaiter area and venous hypertension signs; an arterial ulcer often occurs distally with diminished perfusion. Assess arterial supply before high-grade compression therapy.

References: NICE NG158 and NICE CG168.

Original simplified NICE-style likely-DVT pathway; clinical judgement and bleeding risk still apply.

4. Breast lump, nipple discharge, mastitis and abscess

The cornerstone of a suspicious breast presentation is triple assessment: clinical assessment, age-appropriate imaging (ultrasound and/or mammography) and tissue sampling when indicated. A new unexplained lump in a person aged 30 or older meets the NICE suspected-cancer-pathway referral criterion; do not reassure merely because the lump is mobile or painless.

Features raising concern include hard or fixed masses, skin tethering, unilateral spontaneous bloody discharge, Paget-like nipple change and suspicious axillary nodes. Lactational mastitis may improve with appropriate antibiotics and continued milk drainage/support; a localised fluctuant collection requires ultrasound and drainage according to local protocol. An infected presentation can coexist with malignancy; reassess non-resolving symptoms.

Reference: NICE NG12.

Original schematic: triple assessment combines complementary components.

5. Thyroid nodules, endocrine neck masses and parathyroid disease

A thyroid swelling is evaluated with history (rapid growth, voice change, irradiation, family history), cervical node exam, TSH and risk-stratified ultrasound. Ultrasound features and size guide fine-needle aspiration cytology; not every nodule requires biopsy. Hyperfunctioning nodules are assessed differently from suspicious nonfunctioning nodules.

Primary hyperparathyroidism is suggested by elevated calcium with inappropriately normal or raised PTH; isolated raised calcium should not automatically be attributed to malignancy. Hypercalcaemia complications include stones and skeletal disease. Symptoms of pheochromocytoma include episodic headache, sweating and palpitations; if operative treatment is planned, appropriate alpha blockade precedes beta blockade.

References: NICE NG145, NICE NG230.

6. Urology: retention, haematuria and obstructed infection

Acute urinary retention causes painful inability to void with a palpable bladder and needs prompt decompression unless urethral injury is suspected. Blood at the meatus after pelvic trauma indicates potential urethral injury: avoid blind repeated urethral attempts and involve urology. Visible unexplained haematuria in a person aged 45 or older warrants suspected-cancer-pathway assessment under NICE criteria when unrelated to an untreated UTI or persisting after treatment.

A febrile patient with an obstructing ureteric stone has a source-control emergency: resuscitate, give appropriate antimicrobials and urgently decompress using ureteric stent or nephrostomy. Definitive stone clearance is usually deferred until sepsis resolves. Testicular torsion is time-critical and should go for urgent exploration when suspicion is high; Doppler ultrasound must not delay surgery.

References: EAU Urolithiasis, EAU acute scrotum.

7. Orthopaedic presentations: hot joint, fracture and limb danger

A painful hot swollen joint is septic arthritis until excluded; assess sepsis, obtain blood cultures and aspirate the joint promptly under the local pathway without delaying life-saving antibiotics in unstable patients. Crystal arthritis does not exclude concomitant infection. For a swollen tense compartment after fracture, pain on passive stretch and increasing analgesic requirements may precede loss of pulses; acute compartment syndrome requires urgent surgical assessment and fasciotomy where indicated.

Proximal femoral fractures may present with shortened externally rotated leg in older adults after a low-energy fall. Examine skin, neurovascular status, baseline mobility and delirium risk; offer prompt analgesia, appropriate imaging and orthogeriatric/trauma management.

References: NHS septic arthritis; NICE Hip Fracture.

8. ENT, head and neck: persistent lumps and airway threats

Neck lump assessment depends on age, persistence, location, systemic features and risk factors. Unexplained persistent cervical or supraclavicular nodes can warrant a cancer pathway. Beware of a rapidly enlarging neck swelling with stridor: airway management and senior anaesthetic/ENT help take precedence over routine scanning.

Salivary gland swelling that worsens with meals suggests duct obstruction; a painless persistent parotid mass needs imaging and tissue diagnosis, with facial nerve examination documented. A child with drooling, toxic appearance and possible supraglottitis must not have forceful throat examination that precipitates obstruction.

9. Skin, soft tissue, melanoma and necrotising infection

A pigmented lesion with evolution, asymmetry, irregular border, colour variation or other concerning dermoscopic features requires risk-stratified assessment and referral. Confirm suspected melanoma using diagnostic excision biopsy with appropriate narrow margins; wide definitive excision decisions follow histology and staging.

Necrotising soft tissue infection can present with pain disproportionate to findings, rapidly advancing erythema, systemic toxicity, bullae or crepitus. Early disease may lack dramatic skin changes. Immediate resuscitation, broad antimicrobial therapy and urgent surgery for debridement are central; do not await a CT or laboratory score when suspicion is high.

Reference: NICE NG12 melanoma.

10. Paediatric surgical presentations and red flags

Infantile hypertrophic pyloric stenosis typically causes progressive non-bilious projectile vomiting around early infancy, with dehydration and hypochloraemic metabolic alkalosis; correct fluid/electrolyte derangement before pyloromyotomy. Bilious vomiting in a neonate is intestinal obstruction until proven otherwise and can be malrotation with volvulus; urgent surgical assessment is required.

Intussusception often produces intermittent crying, pallor and drawing up of the legs; the classic red-currant-jelly stool is late and not essential. Ultrasound may show target sign and stable uncomplicated cases may be reduced by air/contrast enema with surgical backup.

11. Neurosurgical and spine surgical emergencies

New urinary retention, saddle anaesthesia, bilateral sciatica or progressive leg neurological deficit in suspected cauda equina syndrome requires urgent spinal review and MRI. A normal plain lumbar radiograph does not exclude compressive neural pathology. A new focal deficit with severe headache or reduced consciousness mandates rapid neuroimaging after resuscitation and appropriate emergency neurological/neurosurgical escalation.

Distinguish neurogenic claudication (often worse on standing or spinal extension, relieved by sitting/flexion) from vascular claudication (exertional calf pain relieved by stopping, independent of posture).

12. MRCS decision framework: choose the next best step

The question may ask for the single best next action, not the diagnosis. Read age, time course, stability, red flags and prior tests before reviewing options. Separate a diagnostic pathway (breast triple assessment, suspected thyroid cancer, haematuria) from a time-critical intervention (torsion, ALI, infected obstruction, septic joint, compartment syndrome).

A common trap is choosing a normally useful imaging study that delays urgent treatment. Another is assuming a negative screening result safely excludes a high-risk condition. At the end of each topic, rehearse: first danger, first test if stable, when to call senior support, and what must not be delayed.

Elective pathway

Risk assessment → target imaging → tissue diagnosis where indicated → multidisciplinary planning.

Time-critical pathway

Resuscitate and escalate → immediate management/source control → targeted imaging only if it will not delay care.

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Initial triage

Recognise instability across surgical specialtiesSeparate immediate intervention from routine referralPerform focused neurovascular assessmentIdentify red flags that should bypass routine imaging

Arterial disease

Claudication and chronic limb-threatening ischaemiaAcute limb ischaemia six Ps and motor threatRutherford ALI classificationABPI interpretation and non-compressible vessels

Venous disease

DVT Wells pathway and ultrasound timingWhen interim anticoagulation is consideredVenous versus arterial ulcer examinationVaricose vein referral indications

Breast

Triple assessment componentsUnexplained breast lump referral pathwayPathological nipple dischargeAbscess versus mastitis and follow-up

Thyroid

TSH and thyroid ultrasoundUltrasound-guided FNA indicationsRed flags for thyroid cancerRecurrent laryngeal nerve examination

Endocrine

PTH in hypercalcaemiaPrimary hyperparathyroidism and renal stonesPhaeochromocytoma symptom triadAlpha then beta blockade principle

Urology

Acute urinary retention first actionTrauma urethral injury cluesHaematuria cancer referralSeptic obstruction decompression

Orthopaedics

Suspected septic arthritis samplingCompartment syndrome early signsHip fracture assessment and imagingNeurovascular documentation after injury

Head and neck

Persistent neck lump work-upStridor and airway red flagsSalivary stone and meal-time painParotid mass and facial nerve

Skin and plastics

Melanoma concerning signs and biopsyNecrotising infection urgent surgeryCellulitis versus deep soft tissue infectionBiopsy and staging planning

Paediatric

Pyloric stenosis acid–base changesBilious newborn vomiting emergencyIntussusception typical presentationTesticular torsion urgency

Spine and nerves

Cauda equina red flagsMRI and urgent spinal referralVascular versus neurogenic claudicationNeuro deficit documentation

Integrated SBA practice

Patient stability determines first stepRefer versus image versus operate decisionsCancer pathways versus emergenciesPlan safety net and re-assessment

40 original MRCS-style surgical-specialty SBAs

Five options per question. A mixed clinical exam follows each teaching module; every option is individually discussed after marking. These are original teaching questions and not a reproduction of exam recalls.

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0 / 40Marked

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N/AAccuracy

Question 1 of 40

Question 1 of 40 · Acute limb ischaemia

Q01. A 69-year-old develops sudden leg pain, pallor and absent pedal Doppler signals. Foot sensation is reduced and ankle dorsiflexion is weak. What is the best initial disposition?

A. Immediate vascular emergency review and limb-rescue pathwayB. Routine claudication clinic next monthC. Prescribe supervised exercise aloneD. Repeat resting ABPI next weekE. Apply compression hosiery

View detailed explanation, examiner trap and viva

Correct answer: A. Immediate vascular emergency review and limb-rescue pathway

Why correct: New neurological deficit with acute ischaemia indicates a threatened limb requiring urgent assessment and revascularisation planning.

Why the other options are incorrect:

B. Routine claudication clinic next month: Motor deficit indicates an immediately threatened limb.

C. Prescribe supervised exercise alone: Exercise treats stable claudication, not acute limb threat.

D. Repeat resting ABPI next week: A delayed screening test cannot address time-critical ischaemia.

E. Apply compression hosiery: Compression does not restore acute arterial flow.

Exam pearl: Motor deficit is a late and serious ALI finding.

Examiner trap: Do not label an acutely weak limb simple intermittent claudication.

Viva extension: How does Rutherford IIb differ from IIa? It has motor weakness and requires immediate revascularisation consideration.

Question 2 of 40 · Peripheral arterial disease

Q02. A smoker experiences calf pain after walking 150 metres that resolves within minutes of standing still. He has reduced pedal pulses but no rest pain. Most appropriate initial objective bedside test?

A. Plain tibia radiographB. Measure ankle-brachial pressure indexC. D-dimerD. ElectromyographyE. Venous duplex only

View detailed explanation, examiner trap and viva

Correct answer: B. Measure ankle-brachial pressure index

Why correct: ABPI provides an accessible objective assessment for suspected PAD and informs further evaluation.

Why the other options are incorrect:

A. Plain tibia radiograph: Bone imaging does not assess arterial perfusion.

C. D-dimer: Designed for thromboembolism pathways, not chronic exertional PAD.

D. Electromyography: Not first-line for classic vascular claudication.

E. Venous duplex only: Venous reflux testing does not establish arterial disease.

Exam pearl: Claudication improves after stopping exertion.

Examiner trap: Normal ABPI in diabetes may be falsely reassuring when arteries are calcified.

Viva extension: Which further tests help if vessels are noncompressible? Toe pressure, Doppler waveform or specialist arterial studies.

Question 3 of 40 · Diabetic PAD

Q03. A 67-year-old with diabetes has a painful toe ulcer and cool foot. ABPI is 1.52. Which inference is most appropriate?

A. Normal arterial supply is definitively establishedB. Venous incompetence is confirmedC. The raised ABPI may reflect non-compressible calcified arteries; assess toe pressure and Doppler waveformsD. There is no need for vascular referralE. Compression therapy must be started immediately

View detailed explanation, examiner trap and viva

Correct answer: C. The raised ABPI may reflect non-compressible calcified arteries; assess toe pressure and Doppler waveforms

Why correct: Medial arterial calcification can make cuffs unable to occlude the artery, causing falsely high ABPI.

Why the other options are incorrect:

A. Normal arterial supply is definitively established: An elevated ABPI may be spuriously high.

B. Venous incompetence is confirmed: ABPI does not diagnose venous reflux.

D. There is no need for vascular referral: Tissue loss plus a cool foot warrants perfusion assessment.

E. Compression therapy must be started immediately: Significant arterial compromise must be assessed first.

Exam pearl: A very high ABPI is not the same as excellent perfusion.

Examiner trap: Do not exclude limb ischaemia from an ABPI of 1.52.

Viva extension: What are alternatives? Toe-brachial index, waveforms and specialist imaging.

Question 4 of 40 · DVT testing

Q04. A postoperative patient has unilateral calf swelling and a DVT Wells score of 3. A proximal leg ultrasound can be arranged within two hours. What is the most appropriate diagnostic next step?

A. Use Homan sign as a confirmatory testB. Order arterial angiographyC. Treat without any objective test because the score is highD. Obtain proximal leg vein ultrasound promptlyE. Discharge because postoperative swelling is always normal

View detailed explanation, examiner trap and viva

Correct answer: D. Obtain proximal leg vein ultrasound promptly

Why correct: A likely DVT (Wells at least 2) enters a prompt proximal venous ultrasound pathway.

Why the other options are incorrect:

A. Use Homan sign as a confirmatory test: Homan sign is not a reliable diagnostic test.

B. Order arterial angiography: Arterial angiography addresses a different vascular problem.

C. Treat without any objective test because the score is high: The NICE pathway uses ultrasound confirmation where promptly available.

E. Discharge because postoperative swelling is always normal: Surgery increases DVT risk; symptoms warrant assessment.

Exam pearl: Combine clinical probability with directed investigations.

Examiner trap: Do not substitute an old physical sign for validated pathways.

Viva extension: If ultrasound cannot be obtained within four hours, how does interim anticoagulation and imaging timing change?

Question 5 of 40 · Venous ulcers

Q05. A patient has a shallow irregular ulcer just above the medial malleolus, ankle pigmentation and oedema. Pedal pulses are present. Most likely underlying pathology?

A. Acute arterial embolismB. Neuropathic pressure ulcerC. Cutaneous melanomaD. Primary bone infectionE. Chronic venous hypertension

View detailed explanation, examiner trap and viva

Correct answer: E. Chronic venous hypertension

Why correct: Medial gaiter ulceration with haemosiderin pigmentation and oedema points towards venous disease.

Why the other options are incorrect:

A. Acute arterial embolism: Embolism usually causes abrupt ischaemic symptoms, not chronic gaiter changes.

B. Neuropathic pressure ulcer: Typically occurs at plantar pressure points with sensory loss.

C. Cutaneous melanoma: Does not classically produce venous pigmentation and oedema.

D. Primary bone infection: Does not account for gaiter-area stasis features.

Exam pearl: Examine arterial circulation before compression.

Examiner trap: Site and surrounding skin matter more than ulcer shape alone.

Viva extension: How do arterial ulcers differ? Often painful distal punched-out lesions with poor perfusion.

Question 6 of 40 · Breast lump assessment

Q06. A 46-year-old woman notices a persistent painless breast lump. It is slightly mobile, with no systemic symptoms. What is the appropriate diagnostic pathway?

A. Specialist breast assessment with clinical examination, imaging and image-guided tissue sampling when indicatedB. Six-month watchful waiting without examinationC. Reassure because the mass is mobileD. Prescribe antibiotics without infection signsE. Use serum CA 15-3 as the sole test

View detailed explanation, examiner trap and viva

Correct answer: A. Specialist breast assessment with clinical examination, imaging and image-guided tissue sampling when indicated

Why correct: Triple assessment combines a focused clinical evaluation, imaging and tissue sampling when necessary.

Why the other options are incorrect:

B. Six-month watchful waiting without examination: Unexplained breast masses in this age group warrant prompt evaluation.

C. Reassure because the mass is mobile: Mobility does not exclude malignancy.

D. Prescribe antibiotics without infection signs: There is no evidence of infectious mastitis.

E. Use serum CA 15-3 as the sole test: Tumour markers are not a diagnostic substitute for triple assessment.

Exam pearl: Breast triple assessment is a process, not one test.

Examiner trap: Do not label a breast lump benign by tenderness or mobility alone.

Viva extension: Which imaging tests are age- and context-appropriate? Ultrasound with mammography as indicated.

Question 7 of 40 · Suspicious breast discharge

Q07. A 58-year-old has spontaneous unilateral bloody nipple discharge from a single duct without fever. Best approach?

A. Treat with oral antibiotics onlyB. Urgent specialist breast assessment and targeted imagingC. Reassure because there is no palpable lumpD. Order a D-dimerE. Begin systemic chemotherapy without biopsy

View detailed explanation, examiner trap and viva

Correct answer: B. Urgent specialist breast assessment and targeted imaging

Why correct: Spontaneous unilateral bloody single-duct discharge is pathological until evaluated and can reflect papilloma or malignancy.

Why the other options are incorrect:

A. Treat with oral antibiotics only: There are no signs of infection to justify antibiotics alone.

C. Reassure because there is no palpable lump: Pathological discharge may occur without a mass.

D. Order a D-dimer: Thrombosis work-up is irrelevant to nipple discharge.

E. Begin systemic chemotherapy without biopsy: Treatment cannot be chosen before diagnosis.

Exam pearl: The character of discharge and laterality are high-yield.

Examiner trap: Absence of a lump does not exclude duct pathology.

Viva extension: What is physiologic discharge? Usually bilateral, multiductal and expressed rather than spontaneous.

Question 8 of 40 · Lactational breast abscess

Q08. A breastfeeding patient has fever, focal fluctuance and a tender red breast despite initial therapy. Ultrasound demonstrates a well-defined fluid cavity. Next step?

A. Stop all milk expression indefinitelyB. Obtain CT brainC. Arrange drainage of the abscess alongside suitable antibiotics and lactation supportD. Perform immediate mastectomyE. Ignore because antibiotics always sterilise collections

View detailed explanation, examiner trap and viva

Correct answer: C. Arrange drainage of the abscess alongside suitable antibiotics and lactation support

Why correct: A confirmed drainable breast abscess requires source control, usually ultrasound-guided aspiration or other appropriate drainage.

Why the other options are incorrect:

A. Stop all milk expression indefinitely: Milk drainage support is often important and cessation can worsen stasis.

B. Obtain CT brain: No neurological indication exists.

D. Perform immediate mastectomy: This is disproportionate to a lactational abscess.

E. Ignore because antibiotics always sterilise collections: An established abscess generally needs drainage.

Exam pearl: Abscess and mastitis management overlap but are not identical.

Examiner trap: Antibiotics cannot reliably replace drainage of a formed abscess.

Viva extension: When should breast inflammatory change prompt evaluation for underlying cancer? If atypical or not resolving.

Question 9 of 40 · Thyroid nodule

Q09. A patient has a thyroid nodule with suspicious hypoechoic ultrasound features. TSH is normal. What best guides whether needle sampling is needed?

A. Perform FNA on every incidental noduleB. Use serum calcitonin in every asymptomatic thyroid noduleC. Rely exclusively on palpationD. Established ultrasound risk-stratification features combined with nodule size and clinical riskE. Use only serum calcium

View detailed explanation, examiner trap and viva

Correct answer: D. Established ultrasound risk-stratification features combined with nodule size and clinical risk

Why correct: NICE thyroid guidance links FNA decisions to an established ultrasound grading system and clinical characteristics.

Why the other options are incorrect:

A. Perform FNA on every incidental nodule: Small low-risk nodules may not require biopsy.

B. Use serum calcitonin in every asymptomatic thyroid nodule: Routine calcitonin is not recommended without MTC suspicion.

C. Rely exclusively on palpation: Palpation cannot classify sonographic malignancy risk.

E. Use only serum calcium: Calcium is not the main thyroid nodule risk test.

Exam pearl: Function and malignancy risk are two different questions.

Examiner trap: Do not biopsy all nodules automatically.

Viva extension: What features raise concern? Microcalcifications, taller-than-wide morphology, irregular margins and suspicious nodes.

Question 10 of 40 · Primary hyperparathyroidism

Q10. A 52-year-old has recurrent calcium-oxalate renal stones. Corrected calcium is high and PTH is high-normal rather than suppressed. Which process is most likely?

A. SIADHB. HypoparathyroidismC. Vitamin D deficiency aloneD. Familial hypocalciuric hypercalcaemia can be assumed without testingE. Primary hyperparathyroidism

View detailed explanation, examiner trap and viva

Correct answer: E. Primary hyperparathyroidism

Why correct: Inappropriately non-suppressed PTH with high calcium suggests PTH-dependent hypercalcaemia, most commonly primary hyperparathyroidism.

Why the other options are incorrect:

A. SIADH: SIADH causes impaired free-water excretion and hyponatraemia, not PTH-dependent hypercalcaemia.

B. Hypoparathyroidism: PTH deficiency typically causes hypocalcaemia.

C. Vitamin D deficiency alone: Often elevates PTH but does not typically cause this PTH-dependent hypercalcaemic pattern.

D. Familial hypocalciuric hypercalcaemia can be assumed without testing: Urinary calcium assessment is needed to distinguish FHH from primary hyperparathyroidism.

Exam pearl: A normal-range PTH is abnormal when calcium is high if not suppressed.

Examiner trap: Check calcium correction, renal function and urine calcium when indicated.

Viva extension: How do you separate FHH? Low urine calcium excretion relative to serum calcium.

Question 11 of 40 · Phaeochromocytoma

Q11. A patient with episodic severe headaches, sweating, palpitations and a confirmed catecholamine-secreting adrenal tumour is being prepared for adrenalectomy. Which principle is correct?

A. Adequate alpha-adrenergic blockade before adding beta blockade when indicatedB. Begin beta blockade alone immediatelyC. Avoid all volume optimisationD. Proceed directly without biochemical preparationE. Give only prophylactic antibiotics as treatment

View detailed explanation, examiner trap and viva

Correct answer: A. Adequate alpha-adrenergic blockade before adding beta blockade when indicated

Why correct: Alpha blockade controls vasoconstriction and reduces perioperative catecholamine crisis risk; beta blockers are added later if needed.

Why the other options are incorrect:

B. Begin beta blockade alone immediately: Unopposed alpha-mediated vasoconstriction can precipitate severe hypertension.

C. Avoid all volume optimisation: Catecholamine-driven volume contraction often requires careful optimisation.

D. Proceed directly without biochemical preparation: Unprepared surgery can provoke a catecholamine crisis.

E. Give only prophylactic antibiotics as treatment: Antibiotics do not control tumour catecholamine effects.

Exam pearl: Alpha before beta is the classic operative safety rule.

Examiner trap: Beta blockade alone is dangerous in suspected phaeochromocytoma.

Viva extension: Which tests establish the diagnosis? Plasma free or urinary fractionated metanephrines in an appropriate setting.

Question 12 of 40 · Acute urinary retention

Q12. A 73-year-old with known prostatic enlargement has severe suprapubic pain and cannot pass urine. Bladder scan shows significant retention, and there is no urethral trauma sign. Best initial step?

A. Observe until next morningB. Prompt bladder decompression by an appropriate urinary catheterC. Give a diuretic challengeD. Arrange elective cystoscopy before drainageE. Administer IV contrast CT as first action

View detailed explanation, examiner trap and viva

Correct answer: B. Prompt bladder decompression by an appropriate urinary catheter

Why correct: Acute painful retention is generally managed with prompt catheterisation and assessment for reversible causes.

Why the other options are incorrect:

A. Observe until next morning: Painful acute retention needs prompt drainage.

C. Give a diuretic challenge: Increasing urine production worsens obstruction.

D. Arrange elective cystoscopy before drainage: Immediate decompression is the priority.

E. Administer IV contrast CT as first action: CT does not relieve retention.

Exam pearl: Do not delay decompression for elective anatomical investigations.

Examiner trap: Blood at the meatus after pelvic trauma changes catheter strategy.

Viva extension: When is suprapubic drainage preferred? When urethral passage is unsafe or unsuccessful with specialist input.

Question 13 of 40 · Urethral injury

Q13. After pelvic fracture, a man has blood at the urethral meatus and cannot void. What is the safest next step?

A. Repeated forceful urethral catheter attemptsB. Give furosemide to force voidingC. Urgent urological assessment and urethral imaging before further blind instrumentationD. Delay bladder drainage indefinitelyE. Start anticoagulation as the sole treatment

View detailed explanation, examiner trap and viva

Correct answer: C. Urgent urological assessment and urethral imaging before further blind instrumentation

Why correct: Meatal blood and retention with pelvic trauma are classic features of possible urethral injury.

Why the other options are incorrect:

A. Repeated forceful urethral catheter attempts: They may exacerbate a urethral disruption.

B. Give furosemide to force voiding: This does not treat the mechanical injury.

D. Delay bladder drainage indefinitely: Urinary diversion may be required urgently.

E. Start anticoagulation as the sole treatment: Does not address urethral trauma.

Exam pearl: Recognise urethral trauma before blind catheterisation.

Examiner trap: A high-riding prostate is an insensitive/variable finding and not required.

Viva extension: Which study is classically used? Retrograde urethrogram when appropriate.

Question 14 of 40 · Haematuria pathway

Q14. A 59-year-old smoker has painless visible haematuria with negative urine culture. No renal colic or fever. Which action is best?

A. Assume it is normal ageingB. Prescribe antibiotics repeatedly without infectionC. Only check the urine again after one yearD. Suspected-cancer-pathway urological referralE. Use PSA alone and discharge

View detailed explanation, examiner trap and viva

Correct answer: D. Suspected-cancer-pathway urological referral

Why correct: NICE NG12 supports expedited cancer evaluation for unexplained visible haematuria in this age range.

Why the other options are incorrect:

A. Assume it is normal ageing: Painless macroscopic haematuria is a significant red flag.

B. Prescribe antibiotics repeatedly without infection: A negative culture and lack of UTI signs do not support this.

C. Only check the urine again after one year: Delays assessment for bladder or upper urinary tract malignancy.

E. Use PSA alone and discharge: PSA is not a substitute for haematuria investigation.

Exam pearl: Visible haematuria requires explanation, not reassurance.

Examiner trap: Do not attribute unexplained bleeding to anticoagulants alone.

Viva extension: What components may be included? Cystoscopy and appropriate upper urinary tract imaging.

Question 15 of 40 · Obstructed infected kidney

Q15. A 61-year-old has fever, hypotension, severe flank pain and hydronephrosis above an obstructing ureteric stone. Antibiotics are started. What additional urgent intervention is required?

A. Wait for cultures before all interventionB. Perform elective extracorporeal lithotripsy next monthC. Encourage only oral fluid intakeD. Give analgesia only and dischargeE. Decompress the collecting system with ureteric stent or percutaneous nephrostomy

View detailed explanation, examiner trap and viva

Correct answer: E. Decompress the collecting system with ureteric stent or percutaneous nephrostomy

Why correct: Obstructed urinary sepsis is an emergency requiring drainage plus resuscitation and antimicrobials.

Why the other options are incorrect:

A. Wait for cultures before all intervention: Cultures guide therapy but cannot delay source control in septic obstruction.

B. Perform elective extracorporeal lithotripsy next month: Delayed elective treatment cannot resolve ongoing infected obstruction.

C. Encourage only oral fluid intake: Hydration alone will not overcome obstructive sepsis.

D. Give analgesia only and discharge: Sepsis plus obstruction is life-threatening.

Exam pearl: Infection + obstruction = urgent drainage.

Examiner trap: Definitive stone fragmentation is generally delayed until infection controlled.

Viva extension: Is ureteric stent or nephrostomy superior? Either can provide effective urgent decompression depending on context.

Question 16 of 40 · Testicular torsion

Q16. A 15-year-old boy presents four hours after sudden severe unilateral testicular pain with vomiting and a high-riding testis. The consultant strongly suspects torsion. Best plan?

A. Urgent scrotal exploration without delaying for routine Doppler imagingB. Oral antibiotics with review in one weekC. Schedule outpatient ultrasound tomorrowD. Reassure because vomiting is commonE. Treat as epididymitis based on age alone

View detailed explanation, examiner trap and viva

Correct answer: A. Urgent scrotal exploration without delaying for routine Doppler imaging

Why correct: High clinical suspicion warrants urgent operative exploration; imaging should not delay surgery.

Why the other options are incorrect:

B. Oral antibiotics with review in one week: Torsion is ischaemic rather than primarily infectious.

C. Schedule outpatient ultrasound tomorrow: Delay risks irreversible testicular damage.

D. Reassure because vomiting is common: Vomiting is a common associated feature of torsion.

E. Treat as epididymitis based on age alone: Acute torsion must be considered first.

Exam pearl: Sudden scrotal pain is time-dependent surgical assessment.

Examiner trap: Preserved Doppler flow in partial torsion can be misleading.

Viva extension: What is the operation? Detorsion and bilateral fixation when appropriate, assessing viability.

Question 17 of 40 · Hot swollen joint

Q17. A 68-year-old with fever, painful swollen knee, restricted passive motion and raised CRP has no trauma. What is the key immediate diagnostic procedure after initial stabilisation?

A. Serum urate aloneB. Urgent joint aspiration for microscopy, Gram stain, culture and crystalsC. Wait two weeks for a plain radiographD. Start long-term steroids without assessmentE. Discharge on NSAIDs because gout is likely

View detailed explanation, examiner trap and viva

Correct answer: B. Urgent joint aspiration for microscopy, Gram stain, culture and crystals

Why correct: Synovial fluid assessment is central to diagnosis while evaluating for sepsis and promptly involving the relevant specialist.

Why the other options are incorrect:

A. Serum urate alone: Urate does not exclude septic arthritis.

C. Wait two weeks for a plain radiograph: Early plain films can be normal and delay risks joint damage.

D. Start long-term steroids without assessment: Steroids may mask or worsen infection.

E. Discharge on NSAIDs because gout is likely: A hot febrile joint needs exclusion of infection.

Exam pearl: Crystals and infection may coexist.

Examiner trap: Do not delay antibiotics in an unstable septic patient simply to obtain aspiration.

Viva extension: How does culture strategy change after prior antibiotics? Yield may be reduced; obtain samples promptly when feasible.

Question 18 of 40 · Compartment syndrome

Q18. After a tibial fracture, an awake patient develops escalating pain despite analgesia and marked pain on passive toe stretch. The dorsalis pedis pulse remains palpable. Most appropriate action?

A. Reassure because pulses are presentB. Apply a tighter circular castC. Urgent orthopaedic reassessment for compartment pressure measurement or fasciotomy as indicatedD. Schedule routine physiotherapyE. Wait for paralysis before intervening

View detailed explanation, examiner trap and viva

Correct answer: C. Urgent orthopaedic reassessment for compartment pressure measurement or fasciotomy as indicated

Why correct: Disproportionate pain and passive-stretch pain after fracture require prompt evaluation for acute compartment syndrome.

Why the other options are incorrect:

A. Reassure because pulses are present: Arterial pulses may persist in early compartment syndrome.

B. Apply a tighter circular cast: External constriction may aggravate compartment pressure.

D. Schedule routine physiotherapy: Mobilisation cannot reverse acute compartment ischaemia.

E. Wait for paralysis before intervening: Paralysis is late and portends irreversible injury.

Exam pearl: A pulse does not rule out compartment syndrome.

Examiner trap: Do not wait for all the classic six Ps.

Viva extension: Which tissues are at risk? Muscle and nerve from elevated intracompartmental pressure.

Question 19 of 40 · Hip fracture

Q19. An 82-year-old falls and has groin pain, a shortened externally rotated leg and inability to weight bear. Best initial imaging?

A. Lumbar spine MRI as the only first studyB. Doppler arterial ultrasoundC. Whole-body bone scan as first-lineD. Anteroposterior pelvis and lateral hip radiographsE. Shoulder X-ray

View detailed explanation, examiner trap and viva

Correct answer: D. Anteroposterior pelvis and lateral hip radiographs

Why correct: Plain orthogonal hip radiographs are first-line in clinically suspected hip fracture.

Why the other options are incorrect:

A. Lumbar spine MRI as the only first study: The presentation localises to proximal femur.

B. Doppler arterial ultrasound: No acute vascular complaint is present.

C. Whole-body bone scan as first-line: Too slow and unnecessary for most acute fractures.

E. Shoulder X-ray: Does not investigate the suspected injury.

Exam pearl: A negative X-ray does not always exclude occult hip fracture.

Examiner trap: If clinical suspicion persists after negative radiographs, MRI is preferred when available promptly.

Viva extension: What other early measures are important? Analgesia, delirium prevention, pressure care and orthogeriatric assessment.

Question 20 of 40 · Neck lump

Q20. A 66-year-old with smoking history has a persistent firm lateral neck node, dysphagia and weight loss. What is the safest initial pathway?

A. Repeated empirical antibiotics without infectionB. Open excision in primary care without planningC. Ignore if not painfulD. Give a short steroid course and dischargeE. Urgent head-and-neck malignancy assessment with imaging and tissue sampling strategy

View detailed explanation, examiner trap and viva

Correct answer: E. Urgent head-and-neck malignancy assessment with imaging and tissue sampling strategy

Why correct: Persistent suspicious lymphadenopathy, especially with upper aerodigestive symptoms, needs expedited specialist assessment.

Why the other options are incorrect:

A. Repeated empirical antibiotics without infection: Malignancy signs warrant prompt evaluation.

B. Open excision in primary care without planning: Unplanned biopsy can complicate specialist work-up and is unsafe.

C. Ignore if not painful: Painless malignant lymphadenopathy is common.

D. Give a short steroid course and discharge: Steroids may mask lymphoma and do not establish diagnosis.

Exam pearl: A neck mass in an older smoker is malignant until evaluated.

Examiner trap: Avoid unplanned invasive procedures before imaging and specialist planning.

Viva extension: Why examine tonsil/base of tongue and nasopharynx? Potential occult head-and-neck primary sources.

Question 21 of 40 · Airway compression

Q21. A patient with rapidly expanding postoperative neck haematoma develops stridor and agitation. What is the immediate priority?

A. Activate emergency airway/surgical help and urgently relieve the compressing haematomaB. Arrange routine outpatient ultrasoundC. Order thyroid function tests firstD. Observe until saturation fallsE. Give oral antibiotics as sole action

View detailed explanation, examiner trap and viva

Correct answer: A. Activate emergency airway/surgical help and urgently relieve the compressing haematoma

Why correct: An expanding neck haematoma with stridor can obstruct the airway within minutes and needs coordinated emergency intervention.

Why the other options are incorrect:

B. Arrange routine outpatient ultrasound: This cannot manage an evolving airway obstruction.

C. Order thyroid function tests first: Biochemistry does not address the immediate mechanical threat.

D. Observe until saturation falls: Oxygen saturation may remain normal until late.

E. Give oral antibiotics as sole action: Antibiotics do not decompress the airway.

Exam pearl: Airway comes before radiology.

Examiner trap: A normal initial oxygen saturation is not reassurance.

Viva extension: What should the team prepare? Skilled airway rescue and prompt wound decompression as required.

Question 22 of 40 · Salivary obstruction

Q22. A 44-year-old experiences painful swelling under the jaw whenever eating sour food; it then subsides. Most likely cause?

A. Branchial cleft cystB. Submandibular duct sialolithiasisC. Thyroglossal duct cystD. Carotid body tumourE. Lymphoma

View detailed explanation, examiner trap and viva

Correct answer: B. Submandibular duct sialolithiasis

Why correct: Salivation against a blocked duct produces recurrent painful meal-associated gland swelling.

Why the other options are incorrect:

A. Branchial cleft cyst: Usually painless and not meal-triggered.

C. Thyroglossal duct cyst: Typically midline, moving with tongue protrusion.

D. Carotid body tumour: Typically slowly enlarging lateral neck mass, unrelated to meals.

E. Lymphoma: Would not produce classic meal-related episodic colic.

Exam pearl: Meal-time swelling suggests salivary outflow obstruction.

Examiner trap: Do not confuse submandibular calculus with persistent painless parotid tumour.

Viva extension: Why submandibular gland? Long ascending duct and more viscous alkaline secretions predispose to stones.

Question 23 of 40 · Parotid tumour

Q23. A 62-year-old has a slowly enlarging firm parotid mass and new facial weakness. What should be done?

A. Reassure because many parotid tumours are benignB. Only give chewing gumC. Urgent specialist imaging and tissue diagnosis for possible malignant parotid tumourD. Massage vigorously until it disappearsE. Perform casual office excision without facial nerve planning

View detailed explanation, examiner trap and viva

Correct answer: C. Urgent specialist imaging and tissue diagnosis for possible malignant parotid tumour

Why correct: A parotid mass with facial nerve dysfunction raises malignancy concern and requires specialist assessment.

Why the other options are incorrect:

A. Reassure because many parotid tumours are benign: Facial palsy is an alarming feature.

B. Only give chewing gum: This is not classic obstructive sialadenitis.

D. Massage vigorously until it disappears: A neoplastic mass will not disappear with massage.

E. Perform casual office excision without facial nerve planning: Parotid surgery requires specialist anatomy and diagnosis.

Exam pearl: Document facial nerve function before parotid surgery.

Examiner trap: New facial palsy is not a feature of a simple benign mobile lump.

Viva extension: What is the main operative risk? Iatrogenic facial nerve injury.

Question 24 of 40 · Melanoma recognition

Q24. An evolving pigmented lesion has asymmetric shape, multiple colours and an irregular border. Which first diagnostic intervention is preferred when feasible?

A. Immediate very wide excision without histologyB. Topical steroid therapyC. Superficial shave that transects the deepest margin intentionallyD. Full-thickness diagnostic excision biopsy with a narrow clinical marginE. No investigation until symptoms develop

View detailed explanation, examiner trap and viva

Correct answer: D. Full-thickness diagnostic excision biopsy with a narrow clinical margin

Why correct: Full-thickness excision provides histological diagnosis and Breslow thickness where anatomically feasible.

Why the other options are incorrect:

A. Immediate very wide excision without histology: Definitive margins depend on Breslow thickness and staging.

B. Topical steroid therapy: No inflammatory dermatosis diagnosis is established.

C. Superficial shave that transects the deepest margin intentionally: Accurate depth measurement may be compromised.

E. No investigation until symptoms develop: Many melanomas are asymptomatic.

Exam pearl: Breslow depth guides further management.

Examiner trap: Do not do a definitive wide-margin melanoma excision before histology.

Viva extension: What further decisions use Breslow thickness? Wide excision margin and sentinel node discussion.

Question 25 of 40 · Necrotising infection

Q25. A diabetic adult has severe thigh pain out of proportion to the skin change, rapidly progressive swelling, tachycardia and hypotension. Best next step?

A. Wait for LRINEC score to confirm before calling surgeryB. Outpatient oral antibiotics and review in five daysC. Physiotherapy for suspected muscle strainD. CT imaging must always precede surgical interventionE. Urgent surgical exploration/debridement alongside resuscitation and broad antimicrobials

View detailed explanation, examiner trap and viva

Correct answer: E. Urgent surgical exploration/debridement alongside resuscitation and broad antimicrobials

Why correct: Necrotising soft-tissue infection is an emergency requiring surgery and antimicrobial therapy.

Why the other options are incorrect:

A. Wait for LRINEC score to confirm before calling surgery: Low/uncertain scores cannot safely exclude early necrotising infection.

B. Outpatient oral antibiotics and review in five days: Rapid systemic deterioration requires emergency management.

C. Physiotherapy for suspected muscle strain: The systemic signs and disproportionate pain are red flags.

D. CT imaging must always precede surgical intervention: Imaging should not delay debridement when clinical suspicion is high.

Exam pearl: Pain out of proportion is an early warning sign.

Examiner trap: Normal skin colour early does not rule out deep necrosis.

Viva extension: Which organisms? Polymicrobial infection or group A Streptococcus among others.

Question 26 of 40 · Diabetic foot infection

Q26. A patient with diabetes has a foot ulcer, spreading erythema, fever and new crepitus. What priority is appropriate?

A. Urgent multidisciplinary assessment for deep infection with resuscitation and source control planningB. Routine podiatry next monthC. Begin high-pressure compression without assessmentD. Treat with topical emollient aloneE. Ignore because diabetes blunts pain

View detailed explanation, examiner trap and viva

Correct answer: A. Urgent multidisciplinary assessment for deep infection with resuscitation and source control planning

Why correct: Severe diabetic foot infection may require admission, early surgery, targeted antibiotics and vascular assessment.

Why the other options are incorrect:

B. Routine podiatry next month: Systemic illness and crepitus suggest a severe infection.

C. Begin high-pressure compression without assessment: Arterial supply and deep infection need assessment first.

D. Treat with topical emollient alone: Deep spreading infection is not superficial dryness.

E. Ignore because diabetes blunts pain: Reduced pain may mask serious infection, not exclude it.

Exam pearl: Assess both infection severity and arterial perfusion.

Examiner trap: No pain does not mean no limb threat in neuropathy.

Viva extension: When should osteomyelitis be suspected? Deep/chronic ulcers, exposed bone or probe-to-bone findings.

Question 27 of 40 · Pyloric stenosis

Q27. A 5-week-old boy has increasingly forceful non-bilious vomiting. Blood gases show metabolic alkalosis with low chloride. What is the correct preoperative management?

A. Immediate pyloromyotomy without resuscitationB. Correct dehydration and electrolyte/acid–base disturbance before pyloromyotomyC. Administer large hypotonic boluses without monitoringD. Treat with antibiotics for presumed sepsis onlyE. Arrange urgent exploratory laparotomy for bowel perforation

View detailed explanation, examiner trap and viva

Correct answer: B. Correct dehydration and electrolyte/acid–base disturbance before pyloromyotomy

Why correct: Pyloric stenosis is usually managed surgically after initial medical stabilisation.

Why the other options are incorrect:

A. Immediate pyloromyotomy without resuscitation: Uncorrected hypochloraemic alkalosis increases perioperative risk.

C. Administer large hypotonic boluses without monitoring: Resuscitation requires appropriately formulated fluids and reassessment.

D. Treat with antibiotics for presumed sepsis only: The classic obstructive history requires confirmation and planned surgery.

E. Arrange urgent exploratory laparotomy for bowel perforation: No signs of perforation or shock are described.

Exam pearl: Correct alkalosis before anaesthesia.

Examiner trap: Pyloric stenosis causes non-bilious, not bilious, vomiting.

Viva extension: Why alkalosis? Repeated gastric HCl loss and renal compensatory changes.

Question 28 of 40 · Bilious vomiting infant

Q28. A two-day-old baby develops green vomiting, abdominal distension and increasing lethargy. Which response is most appropriate?

A. Reassure because green vomit is normal colostrumB. Treat as uncomplicated reflux and dischargeC. Treat as possible intestinal obstruction/malrotation with volvulus and obtain urgent paediatric surgical assessmentD. Start solid food trialsE. Delay imaging/referral for a week

View detailed explanation, examiner trap and viva

Correct answer: C. Treat as possible intestinal obstruction/malrotation with volvulus and obtain urgent paediatric surgical assessment

Why correct: Neonatal bilious vomiting demands urgent assessment because malrotation with volvulus may rapidly threaten bowel viability.

Why the other options are incorrect:

A. Reassure because green vomit is normal colostrum: Bilious vomiting is a surgical red flag in neonates.

B. Treat as uncomplicated reflux and discharge: Reflux does not explain this dangerous presentation.

D. Start solid food trials: Inappropriate and potentially harmful in a neonate.

E. Delay imaging/referral for a week: Volvulus can cause rapid bowel ischaemia.

Exam pearl: Green vomiting in a neonate = urgent obstruction work-up.

Examiner trap: Do not wait for bloody stool or severe distension.

Viva extension: What investigations may help if stable? Abdominal X-ray and targeted upper GI contrast study with surgical coordination.

Question 29 of 40 · Intussusception

Q29. A 10-month-old has episodic severe crying, pallor, vomiting and periods of apparent wellness. Ultrasound shows a target sign; he is stable with no peritonitis. Best definitive initial treatment approach?

A. Immediate discharge because episodes resolveB. Antispasmodic aloneC. Routine colonoscopy in an adult unitD. Air or contrast enema reduction with appropriate specialist supportE. Avoid any treatment until red-currant-jelly stool appears

View detailed explanation, examiner trap and viva

Correct answer: D. Air or contrast enema reduction with appropriate specialist support

Why correct: Pneumatic/hydrostatic reduction can be first-line in stable uncomplicated intussusception with surgical backup.

Why the other options are incorrect:

A. Immediate discharge because episodes resolve: Intermittent improvement is characteristic of intussusception.

B. Antispasmodic alone: Does not reduce telescoped bowel.

C. Routine colonoscopy in an adult unit: Not standard paediatric initial management.

E. Avoid any treatment until red-currant-jelly stool appears: That finding is late and not necessary for diagnosis.

Exam pearl: The classic triad is frequently incomplete.

Examiner trap: Do not insist on currant jelly stool.

Viva extension: What contraindicates enema reduction? Peritonitis, perforation or instability.

Question 30 of 40 · Cauda equina

Q30. A 49-year-old develops severe low-back pain, bilateral sciatica, saddle numbness and new painless urinary retention. What is the most appropriate action?

A. Plain lumbar radiograph then discharge if normalB. Routine physiotherapy referralC. Wait for complete leg paralysisD. Oral analgesia alone and outpatient reviewE. Emergency MRI and urgent spinal surgical referral

View detailed explanation, examiner trap and viva

Correct answer: E. Emergency MRI and urgent spinal surgical referral

Why correct: New sphincter disturbance and saddle sensory loss suggest cauda equina syndrome requiring emergency assessment.

Why the other options are incorrect:

A. Plain lumbar radiograph then discharge if normal: Plain radiographs cannot exclude cauda equina compression.

B. Routine physiotherapy referral: Neurological red flags demand emergency imaging.

C. Wait for complete leg paralysis: Delay risks permanent bladder and neurological dysfunction.

D. Oral analgesia alone and outpatient review: Does not address compressive neurological emergency.

Exam pearl: Bladder dysfunction is a critical spinal red flag.

Examiner trap: Normal reflexes do not exclude cauda equina syndrome.

Viva extension: What examination should be documented? Lower limb power, sensation, perineal findings and bladder assessment.

Question 31 of 40 · Claudication distinction

Q31. A 72-year-old feels bilateral leg discomfort after prolonged standing or walking downhill; sitting and bending forward relieve symptoms. Leg pulses are palpable. What mechanism is most consistent?

A. Neurogenic claudication from lumbar spinal canal narrowingB. Acute arterial embolismC. Deep vein thrombosisD. Acute compartment syndromeE. Testicular torsion

View detailed explanation, examiner trap and viva

Correct answer: A. Neurogenic claudication from lumbar spinal canal narrowing

Why correct: Flexion-relieved walking/standing leg symptoms are characteristic of neurogenic claudication.

Why the other options are incorrect:

B. Acute arterial embolism: Would present suddenly with perfusion deficit rather than flexion-dependent pain.

C. Deep vein thrombosis: DVT usually causes persistent unilateral swelling/tenderness.

D. Acute compartment syndrome: Pain is severe and escalating after injury/exertion, not posture-relieved.

E. Testicular torsion: Unrelated to bilateral posture-sensitive leg pain.

Exam pearl: Shopping-cart sign suggests lumbar stenosis.

Examiner trap: Pulse palpation alone cannot completely exclude arterial disease.

Viva extension: Which exam helps separate causes? Vascular examination/ABPI and neuro-spinal assessment.

Question 32 of 40 · Thyroid voice change

Q32. A 48-year-old has a rapidly enlarging thyroid nodule and new persistent hoarseness. What is the best next approach?

A. Routine review in twelve monthsB. Urgent thyroid/head and neck specialist assessment including voice/nerve evaluationC. Prescribe antibiotics without infection signsD. Ignore hoarseness as unrelatedE. Offer thyroid hormone empirically to shrink the nodule

View detailed explanation, examiner trap and viva

Correct answer: B. Urgent thyroid/head and neck specialist assessment including voice/nerve evaluation

Why correct: Rapid growth with dysphonia suggests possible invasive thyroid disease; evaluate urgently.

Why the other options are incorrect:

A. Routine review in twelve months: Rapid growth and voice change are concerning for invasive disease.

C. Prescribe antibiotics without infection signs: No basis for treating a bacterial illness.

D. Ignore hoarseness as unrelated: It may reflect recurrent laryngeal nerve involvement.

E. Offer thyroid hormone empirically to shrink the nodule: Does not appropriately assess suspected cancer.

Exam pearl: Preoperative voice change warrants documenting vocal cord function.

Examiner trap: A normal TSH does not rule out thyroid malignancy.

Viva extension: Which nerve controls most intrinsic laryngeal muscles? Recurrent laryngeal nerve.

Question 33 of 40 · DVT scan delay

Q33. A patient has a DVT Wells score of 3 and ultrasound cannot be obtained within four hours. No contraindication to anticoagulation exists. According to NICE, which pathway is appropriate?

A. Cancel DVT investigation because there is no scan todayB. Use Homan sign to decide treatmentC. Interim therapeutic anticoagulation with ultrasound arranged urgently (within 24 hours) as guided by protocolD. Only start compression hosiery and review next monthE. Perform breast ultrasound instead

View detailed explanation, examiner trap and viva

Correct answer: C. Interim therapeutic anticoagulation with ultrasound arranged urgently (within 24 hours) as guided by protocol

Why correct: NICE NG158 advises interim anticoagulation and timely proximal vein ultrasound when likely DVT cannot be scanned promptly.

Why the other options are incorrect:

A. Cancel DVT investigation because there is no scan today: Delay does not negate high clinical probability.

B. Use Homan sign to decide treatment: Homan sign has poor diagnostic accuracy.

D. Only start compression hosiery and review next month: This is not appropriate for possible acute proximal DVT.

E. Perform breast ultrasound instead: Unrelated to suspected venous thrombosis.

Exam pearl: Know the 4-hour/24-hour branch of the NICE DVT pathway.

Examiner trap: Always assess bleeding risk before anticoagulation.

Viva extension: What if initial proximal ultrasound is negative but D-dimer positive? Follow the repeat imaging pathway.

Question 34 of 40 · Acute limb anticoagulation

Q34. A patient with suspected acute limb ischaemia is awaiting urgent vascular evaluation. Unless contraindicated, what systemic pharmacological action is usually initiated early?

A. High-dose topical heparin onlyB. Long-term oral aspirin aloneC. Immediate oral warfarin as sole acute treatmentD. Intravenous unfractionated heparin according to the vascular emergency pathwayE. Thrombolytic infusion for every presentation without assessment

View detailed explanation, examiner trap and viva

Correct answer: D. Intravenous unfractionated heparin according to the vascular emergency pathway

Why correct: Systemic heparin is generally used early to prevent propagation pending definitive management, subject to contraindications.

Why the other options are incorrect:

A. High-dose topical heparin only: Topical treatment does not prevent thrombus propagation.

B. Long-term oral aspirin alone: Antiplatelet therapy alone is insufficient for acute threatened limb management.

C. Immediate oral warfarin as sole acute treatment: Warfarin has a delayed effect and is not the usual initial acute action.

E. Thrombolytic infusion for every presentation without assessment: Intervention selection depends on limb threat, anatomy and bleeding risk.

Exam pearl: Heparin does not replace revascularisation.

Examiner trap: Check for major contraindications, including active bleeding.

Viva extension: Why choose unfractionated heparin? Rapid onset and reversible/titratable properties.

Question 35 of 40 · Melanoma staging

Q35. Histology from a diagnostic pigmented lesion excision reports invasive melanoma with Breslow thickness. Which characteristic best guides the next definitive local excision margin?

A. Whether the lesion itched at presentationB. The patient’s hair colour onlyC. Serum C-reactive proteinD. Original diameter alone without histologyE. Measured Breslow thickness and melanoma staging context

View detailed explanation, examiner trap and viva

Correct answer: E. Measured Breslow thickness and melanoma staging context

Why correct: Definitive melanoma management is stage-adapted; tumour thickness helps determine surgical margins and nodal discussion.

Why the other options are incorrect:

A. Whether the lesion itched at presentation: Itching is not the key determinant of margin size.

B. The patient’s hair colour only: Phenotype is a risk factor but not margin guidance.

C. Serum C-reactive protein: Not a primary determinant of local excision margin.

D. Original diameter alone without histology: Invasive depth guides margin decisions.

Exam pearl: Diagnostic narrow excision is not the final wide excision.

Examiner trap: Avoid margin decisions solely from ABCDE visual signs.

Viva extension: When is sentinel lymph-node biopsy discussed? Based on thickness and other risk factors.

Question 36 of 40 · Referral red flag

Q36. A 63-year-old develops a painless testicular enlargement over two months without fever. What is the most appropriate disposition?

A. Expedited suspected-testicular-cancer assessment and ultrasoundB. Prescribe antibiotics indefinitelyC. Reassure due to absence of painD. Wait until the size doublesE. Order a PSA as the sole diagnostic test

View detailed explanation, examiner trap and viva

Correct answer: A. Expedited suspected-testicular-cancer assessment and ultrasound

Why correct: Unexplained non-painful testicular shape or texture change warrants urgent specialist assessment.

Why the other options are incorrect:

B. Prescribe antibiotics indefinitely: A painless persistent mass may be malignant.

C. Reassure due to absence of pain: Testicular cancer is commonly painless.

D. Wait until the size doubles: Delay serves no purpose.

E. Order a PSA as the sole diagnostic test: PSA is not a test for a testicular mass.

Exam pearl: Painless does not mean harmless.

Examiner trap: Do not confuse acute painful torsion pathway with testicular tumour pathway.

Viva extension: Which serum markers can be relevant after specialist evaluation? AFP, beta-hCG and LDH.

Question 37 of 40 · Sepsis and drainage

Q37. A patient with a soft-tissue abscess has increasing fever and enlarging fluctuance despite appropriate antibiotics. What element is most likely missing?

A. Escalate analgesic doses onlyB. Effective drainage/source control of the established collectionC. Add an unnecessary second antibiotic without assessmentD. Reassure because fluctuation is benignE. Elective excision months later without treating current infection

View detailed explanation, examiner trap and viva

Correct answer: B. Effective drainage/source control of the established collection

Why correct: Drainable purulent collections generally require source control in addition to correctly selected antibiotics.

Why the other options are incorrect:

A. Escalate analgesic doses only: Pain relief does not remove an abscess source.

C. Add an unnecessary second antibiotic without assessment: Broader therapy alone may not sterilise a collection.

D. Reassure because fluctuation is benign: A fluctuating collection may need drainage.

E. Elective excision months later without treating current infection: Ongoing sepsis requires timely action.

Exam pearl: Abscess is different from diffuse cellulitis.

Examiner trap: No response to antibiotics should prompt diagnostic reassessment.

Viva extension: What cultures? Send appropriate pus/tissue samples when feasible.

Question 38 of 40 · Postmenopausal breast changes

Q38. A 66-year-old has unilateral eczematous nipple change and underlying induration not responding to topical treatment. Which condition is important to exclude?

A. Simple bilateral contact eczema onlyB. Acute arterial limb ischaemiaC. Paget disease of the nipple with underlying breast malignancyD. Pyloric stenosisE. Physiologic lactation

View detailed explanation, examiner trap and viva

Correct answer: C. Paget disease of the nipple with underlying breast malignancy

Why correct: Persistent unilateral nipple eczema may represent mammary Paget disease and needs specialist breast assessment.

Why the other options are incorrect:

A. Simple bilateral contact eczema only: Unilateral persistent nipple change with induration needs malignancy evaluation.

B. Acute arterial limb ischaemia: Does not involve breast nipple changes.

D. Pyloric stenosis: Paediatric upper GI obstruction, unrelated.

E. Physiologic lactation: Does not explain unilateral indurated eczema.

Exam pearl: Unilateral chronic nipple change is a classic examiner trap.

Examiner trap: A response to topical steroids does not definitively rule out malignancy.

Viva extension: What is the diagnostic confirmation? Targeted nipple biopsy with breast imaging.

Question 39 of 40 · Compartment syndrome pressure

Q39. An obtunded patient after a crush injury has a markedly swollen tense calf. Clinical pain assessment is impossible. What adjunct helps assess suspected compartment syndrome?

A. Rely on palpable pulse aloneB. Wait for the patient to awaken tomorrowC. Use serum potassium as the only testD. Serial/continuous compartment pressure monitoring within urgent orthopaedic assessmentE. Assume postoperative swelling is always physiological

View detailed explanation, examiner trap and viva

Correct answer: D. Serial/continuous compartment pressure monitoring within urgent orthopaedic assessment

Why correct: When examination is unreliable, pressure measurements can support urgent diagnosis and surgical decision-making.

Why the other options are incorrect:

A. Rely on palpable pulse alone: Pulses can remain present despite harmful compartment pressure.

B. Wait for the patient to awaken tomorrow: Ischaemic damage may occur during delay.

C. Use serum potassium as the only test: Potassium may be raised in muscle injury but is not diagnostic.

E. Assume postoperative swelling is always physiological: Tense swelling warrants evaluation.

Exam pearl: Unconscious patients can develop silent compartment syndrome.

Examiner trap: Never rely on a single late sign like absent pulse.

Viva extension: What pressure concept is used? Delta pressure relative to diastolic BP, interpreted clinically.

Question 40 of 40 · Specialty prioritisation

Q40. A surgical referral list includes a stable breast lump, chronic claudication, suspected torsion of two hours duration, and an uncomplicated thyroid nodule. Which patient needs the most immediate surgical assessment?

A. The stable breast lump referralB. The chronic intermittent claudication patientC. The uncomplicated thyroid noduleD. All four have identical urgencyE. The patient with suspected acute testicular torsion

View detailed explanation, examiner trap and viva

Correct answer: E. The patient with suspected acute testicular torsion

Why correct: Testicular salvage is time-dependent and suspected torsion requires emergency surgical assessment.

Why the other options are incorrect:

A. The stable breast lump referral: It requires expeditious work-up but not minute-to-minute intervention.

B. The chronic intermittent claudication patient: Usually managed in a planned PAD pathway absent rest pain/tissue loss.

C. The uncomplicated thyroid nodule: Risk-stratified outpatient assessment is appropriate if stable.

D. All four have identical urgency: Different presentations have very different time-to-treatment consequences.

Exam pearl: Triage urgency before diagnosis depth.

Examiner trap: Do not treat every use of the word “urgent” as equally time-critical.

Viva extension: What other cases outrank routine clinics? Threatened limb, airway obstruction and septic obstruction.

Frequently asked questions

Should every new breast lump be biopsied?

Not automatically. Clinical history, ultrasound/mammography and a validated imaging-risk pathway determine when tissue sampling is necessary. All unexplained lumps still deserve appropriate clinical assessment.

Does a palpable distal pulse exclude acute limb threat?

No. Pulses can be affected by collateral circulation or can persist during early compartment syndrome. Neurological deficits and evolution of symptoms matter.

Is an ABPI above one always reassuring?

Not in non-compressible arteries, particularly in diabetes or renal disease. Toe pressures and waveforms can be more informative.

What if a hot joint contains urate crystals?

Crystals do not exclude coexisting septic arthritis. Use synovial sampling, microbiology and clinical assessment.

Does a negative Doppler study exclude torsion?

Clinical suspicion remains central. Partial/intermittent torsion can have confusing Doppler findings; high suspicion needs emergency surgical review.

Can a stable painless neck mass be observed indefinitely?

No. Persistence, age, nodal features and cancer symptoms govern expedited assessment.

Which surgical emergencies need source control?

Examples include infected urinary obstruction, drainable abscess, necrotising infection and some septic joints.

Are these actual MRCS recall questions?

No. They are new original SBAs informed by syllabus priorities and independently checked clinical principles. Original recall files remain a separate, provenance-tagged project.

References and related MRCS Academy lessons

Guidelines were reviewed in October 2026 for educational use. Local protocols and individual clinical circumstances determine practice.

1. Intercollegiate MRCS Candidate Guidance
2. NICE CG147 — Peripheral arterial disease
3. ESVS — Acute limb ischaemia
4. NICE NG158 — Venous thromboembolic diseases
5. NICE NG12 — Suspected cancer referrals
6. NICE NG230 — Thyroid cancer assessment
7. EAU — Urolithiasis
8. EAU — Acute scrotum
9. NICE NG19 — Diabetic foot
10. NICE CG124 — Hip fracture

Published MRCS Academy lessons

Use the topic cards below to revisit foundational anatomy, physiology, pharmacology and previous clinical-surgery articles.

Article 01
Start MRCS HereArticle 02
Complete SyllabusArticle 03
Books and ResourcesArticle 04
12-Week Study PlanArticle 05
SBA Question StrategyArticle 06
Common Preparation MistakesArticle 07
Surgical Anatomy OverviewArticle 08
Upper Limb AnatomyArticle 09
Inguinal & Abdominal WallArticle 10
Head & Neck Surgical AnatomyArticle 11
Cardiovascular & Respiratory PhysiologyArticle 12
Renal & Acid–Base PhysiologyArticle 13
GI, Endocrine & NeurophysiologyArticle 14
Lower Limb Surgical Anatomy Made Easy for MRCS Part AArticle 15
Thoracic, Pelvic and Visceral Surgical AnatomyArticle 16
Surgical Pathology, Inflammation and Wound Healing Made Easy for MRCS Part AArticle 17
Surgical Pharmacology and Microbiology Made Easy for MRCS Part AArticle 18
Perioperative Care, Anaesthesia and Surgical Complications Made Easy for MRCS Part AArticle 19
Trauma, Shock and Burns Made Easy for MRCS Part AArticle 20
Acute Abdomen and Emergency Surgical Conditions Made Easy for MRCS Part A

Previous lesson: Article 20 — Acute Abdomen and Emergency Surgical Conditions

Next planned: Article 22 — Ethics, Statistics and Audit for MRCS Part A. Its published URL will be added after publication.