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MRCS Part A — Abdomen & Vessels

52 Consolidated MCQs · 123 Source Recalls · Anatomy, Vascular Relations & Clinical Surgery

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MRCS Part A — Abdomen & Vessels: High-Yield Revision Notes

Structured notes by topic, not individual MCQ summaries. Based on the supplied 52-question document; use the linked MCQs to test each section.

1. Major abdominal arterial anatomy

Aortic origins and levels

Coeliac trunk	Around T12; foregut
Superior mesenteric artery (SMA)	Around L1; midgut
Renal arteries	Usually L1–L2, below SMA
Inferior mesenteric artery (IMA)	Around L3; hindgut
Aortic bifurcation	Usually L4; common iliac arteries

Mesenteric distributions

SMA branches	Middle colic: proximal two-thirds transverse colon; ileocolic: terminal ileum, caecum, appendix
IMA branches	Left colic: descending/distal transverse colon; sigmoid arteries: sigmoid colon; superior rectal: upper rectum
Surgical high tie	Dividing IMA close to aortic origin; a low tie can preserve left colic artery

Anastomoses and watershed zones

Griffiths point	Splenic flexure: middle colic (SMA) meets left colic (IMA); vulnerable to low flow
Marginal artery of Drummond	Collateral arcade near colonic margin joining colic territories
Arc of Riolan	Variable central SMA–IMA collateral route; middle colic may maintain IMA territory in occlusion

Embryology

Midgut rotates a total of 270° anticlockwise around SMA (viewed anteriorly): 90° during physiological herniation, 180° on return. Persistent vitelline arterial supply to a Meckel diverticulum belongs to the SMA system.

Practice related MCQs: Q14, Q19, Q27, Q34, Q38, Q39, Q41, Q43, Q44, Q51

2. Splenic vessels, pancreas and splenectomy

Splenic artery and vein

Splenic artery	Coeliac trunk branch running tortuously along the superior border of pancreas
Splenic vein	Runs posterior to pancreatic body; joins SMV behind the pancreatic neck to form portal vein
Splenorenal ligament	Contains splenic hilar vessels and pancreatic tail
Gastrosplenic ligament	Contains short gastric and left gastroepiploic vessels

Operative injury patterns

Hilar ligation endangers the pancreatic tail → postoperative leak/fistula. Division of short gastric vessels endangers gastric fundus. Separate the pancreatic tail from the hilar pedicle before division.

Pancreatic relationships

Uncinate process lies posterior to SMA/SMV; pancreatic neck lies anterior to superior mesenteric vessels. Splenic vein thrombosis can cause isolated gastric varices.

Practice related MCQs: Q1, Q2, Q16, Q18, Q22, Q47, Q52

3. Gastric, duodenal and oesophageal circulation

Arterial supply

Lesser curvature	Left and right gastric arteries
Proximal greater curvature and fundus	Left gastroepiploic + short gastric arteries from splenic system
Distal greater curvature / antrum	Right gastroepiploic arises from gastroduodenal artery
Abdominal oesophagus	Ascending left gastric branches; inferior phrenic contributions also occur
First part of duodenum (posterior)	Gastroduodenal artery lies close behind D1

Clinical and operative contrasts

Posterior duodenal ulcer → gastroduodenal arterial haemorrhage. Anterior duodenal ulcer → free perforation. Fundal lymph passes through regional perigastric/pancreaticosplenic nodes towards coeliac nodes.

Portal hypertension

Lower oesophageal varices: portal-side left gastric tributaries communicate with oesophageal veins draining to azygos-system channels. Short gastric veins are more associated with gastric fundal varices.

Practice related MCQs: Q5, Q7, Q8, Q20, Q32, Q35

4. Renal vessels, hilum, gonadal and adrenal veins

Renal vascular relationships

Renal hilum: anterior → posterior	Renal vein → renal artery → renal pelvis (V–A–P)
Right renal artery	Passes posterior to inferior vena cava en route to right kidney
Left renal vein	Usually anterior to aorta and posterior to SMA; retroaortic/circumaortic variants exist
Anterior nutcracker syndrome	Compression of left renal vein between SMA and aorta; left varicocele may result

Venous drainage

Right gonadal / testicular vein	Usually directly into IVC
Left gonadal / testicular vein	Usually into left renal vein
Right adrenal vein	Usually directly into IVC; short and surgically important
Left adrenal vein	Usually into left renal vein, sometimes via common trunk with inferior phrenic
Inferior epigastric vein	Deep inferior epigastric drains to external iliac; superficial epigastric drains to femoral

Varicocele assessment

Left-sided varicocele may reflect left renal vein outflow obstruction. When clinical examination is inconclusive, scrotal Doppler ultrasound is the initial imaging test.

Practice related MCQs: Q3, Q4, Q6, Q10, Q13, Q23, Q33, Q37, Q40, Q46, Q48, Q49, Q50

5. Portal venous anatomy and collateral pathways

Portal vein formation

Splenic vein joins SMV behind neck of pancreas to create the portal vein. IMV most commonly drains into splenic vein; anatomical variations include SMV or portal confluence.

Portosystemic connections

Portal hypertensive flow via left gastric veins and oesophageal azygos connections produces lower oesophageal varices; short gastric-related collateral pathways contribute to fundal varices.

Clinical distinction

Dilated oesophageal submucosal veins rupture; left gastric vein is the principal portal tributary of that pathway, not the name of the vessel that ruptures.

Practice related MCQs: Q5, Q36, Q52

6. Renal transplantation: vascular emergencies and rejection

Distinguishing early graft complications

Hyperacute rejection	Minutes to hours following reperfusion; pre-existing donor-reactive anti-ABO/anti-HLA antibodies, complement activation
Acute T-cell-mediated rejection	Often days or later; biopsy with interstitial T-cell infiltration and tubulitis
Renal artery thrombosis	Sudden anuria + absent main arterial/intrarenal Doppler perfusion
Renal vein thrombosis	Painful swollen graft, anuria; absent venous flow and possible reversed arterial diastolic flow

Immediate assessment

Confirm urinary catheter patency, haemodynamic status, Doppler arterial/venous flow and exclude surgical obstruction. An absent arterial or venous signal demands urgent transplant-team assessment; biopsy is used to establish rejection after appropriate evaluation.

Examiner trap

Timing or a dusky swollen graft alone does not establish the diagnosis. Reversed diastolic arterial flow is not independently pathognomonic of venous thrombosis.

Practice related MCQs: Q25, Q26, Q28, Q29

7. Intestinal ischaemia, short bowel and clinical surgery

Ischaemia and anatomy

Splenic flexure (Griffiths point) and rectosigmoid region are vulnerable watershed sites. Colonic collateral routes should be assessed when major mesenteric branches are compromised.

Intestinal failure

With only approximately 5 cm of jejunum connected to colon after massive resection, enteral absorption is insufficient for long-term support: parenteral nutrition and IV fluid/electrolyte supplementation are generally required.

After Roux-en-Y bypass

Confirmed iron deficiency that persists despite adequate oral therapy may need intravenous iron; investigate bleeding and concurrent B12/folate deficiency.

Splenic and lymphatic clinical signs

Hypersplenism causes blood-cell sequestration and macrophage-mediated destruction; left supraclavicular Virchow node (Troisier sign when pathological) is classically associated with gastric malignancy, but is not specific.

Practice related MCQs: Q11, Q12, Q21, Q30, Q42

8. Other vascular, nerve and applied anatomy

Nerves and autonomic receptors

Beta-1 receptors	Cardiac myocardium: increase heart rate, conduction and contractility; juxtaglomerular receptors increase renin
Beta-2 receptors	Bronchial smooth-muscle relaxation
Lateral femoral cutaneous nerve	L2–L3, purely sensory; entrapment near ASIS/inguinal ligament → meralgia paraesthetica

Named vessels and plexuses

Kiesselbach plexus	Anterior nasal septum (Little area): common source of anterior epistaxis
Coronary dominance	Determined by origin of posterior descending/posterior interventricular artery: RCA in right dominance; circumflex in left
Inferior rectal artery	Usually internal pudendal branch supplying lower anal canal below pectinate line

Examiner trap

Blood on digital rectal examination alone cannot localise a particular bleeding artery; angiographic localisation is needed to select an embolisation target.

Practice related MCQs: Q9, Q15, Q17, Q24, Q31, Q45

9. Rapid final-revision tables

Five relationships to memorise

Pancreatic tail	At risk in splenic hilar dissection
Fundus	At risk during short gastric vessel division
Renal hilum	V–A–P (front → back)
Left renal vein	Aorta behind; SMA in front
Right renal artery	Passes behind IVC

Five core vascular associations

Posterior D1 ulcer	Gastroduodenal artery
Splenic flexure	SMA–IMA watershed
Lower oesophageal varices	Left gastric ↔ azygos-system pathway
IMV	Usually enters splenic vein
PDA origin	Defines coronary arterial dominance

Practice related MCQs: Q1, Q5, Q10, Q14, Q18, Q23, Q25, Q26, Q28, Q29, Q36, Q39, Q41

Question 1 / 52

During ligation of the splenic hilar vessels, which structure is most at risk of injury?

Asked in:Sep2016Apr2018Jan2020Sep2020Apr2021Sep 2022 / 2023 ?Apr2025

Question 2 / 52

Along which border of the pancreas does the splenic artery usually run?

Asked in:Session not recorded

Question 3 / 52

The left testicular vein usually drains into which vessel?

Asked in:Session not recorded

Question 4 / 52

In normal anatomy, the left renal vein crosses the aorta in which position?

Asked in:Jan2016Jan2017Jan2019Apr2021

Question 5 / 52

Which portal tributary chiefly supplies the portosystemic collateral pathway responsible for lower oesophageal varices?

Asked in:Sep2016Sep2018Jan2020Sep2020Sep2021

Question 6 / 52

The main renal arteries usually arise from the aorta near which vertebral level?

Asked in:Session not recorded

Question 7 / 52

A posterior ulcer in the first part of the duodenum causes massive haematemesis. Which artery is most likely eroded?

Asked in:Jan2017Sep2018Jan2021

Question 8 / 52

An ulcer lies near the greater curvature at the body–antrum junction. Which artery is most closely related?

Asked in:Sep2017Sep2018Sep2020Sep2021Sep2024Jan2026Undated recall

Question 9 / 52

Beta-1 adrenoceptors are particularly prominent in which tissue?

Asked in:Sep2017

Question 10 / 52

Which structure lies immediately anterior to the main renal artery at the renal hilum?

Asked in:Sep2017Sep2022

Question 11 / 52

Which site is the classic watershed between superior and inferior mesenteric arterial territories?

Asked in:Sep2018

Question 12 / 52

What best explains increased red-cell destruction in hypersplenism?

Asked in:Apr2019

Question 13 / 52

The right testicular vein usually drains directly into which vessel?

Asked in:Sep2019May2022Apr2025

Question 14 / 52

At which vertebral level does the abdominal aorta usually divide into common iliac arteries?

Asked in:Jan2020Sep2024Apr2026

Question 15 / 52

Most anterior nasal septal bleeding arises from which vascular network?

Asked in:Jan2020

Question 16 / 52

During division of the short gastric vessels at splenectomy, which structure is most at risk of direct injury?

Asked in:Jan2020Apr2021

Question 17 / 52

The inferior epigastric vein usually drains into which vein?

Asked in:Sep2018Sep2020

Question 18 / 52

Which ligament contains the splenic hilar vessels and pancreatic tail?

Asked in:Jan2021

Question 19 / 52

If a high vascular tie is chosen during anterior resection, which artery is divided near its aortic origin?

Asked in:Jan2021Jan2025

Question 20 / 52

The right gastroepiploic artery normally arises from which vessel?

Asked in:Sep2016Sep2021Undated recall

Question 21 / 52

A patient has iron-deficiency anaemia, weight loss and a hard left supraclavicular node. Which malignancy is classically associated?

Asked in:Undated recall

Question 22 / 52

Which artery passes anterior to the uncinate process of the pancreas?

Asked in:Apr2018Apr2021Apr2026

Question 23 / 52

The right renal artery passes posterior to which major vessel?

Asked in:May2022Jan2024Apr2025

Question 24 / 52

The lateral femoral cutaneous nerve usually arises from which spinal roots?

Asked in:Session not recorded

Question 25 / 52

A renal graft becomes cyanotic minutes after reperfusion; major vessels are patent and preformed donor-reactive antibodies are demonstrated. What is the cause?

Asked in:May2022

Question 26 / 52

Ten days after transplantation, creatinine rises; graft vessels are patent and biopsy shows tubulitis with interstitial T-cell infiltration. What is the diagnosis?

Asked in:Sep 2022 / 2023 ?

Question 27 / 52

Which artery is the principal named supply to the descending colon?

Asked in:Jan2021Jan2023

Question 28 / 52

A renal transplant recipient develops sudden anuria despite a patent urinary catheter. Doppler shows absent main renal arterial and intrarenal perfusion. What is most likely?

Asked in:Session not recorded

Question 29 / 52

Ten days after transplantation, a patient develops graft pain, swelling and anuria. Doppler shows absent renal venous flow with reversed arterial diastolic flow. What is most likely?

Asked in:Sep2024

Question 30 / 52

A stable patient develops iron-deficiency anaemia after Roux-en-Y gastric bypass despite adequate oral iron. Bleeding has been excluded. What is the best next replacement?

Asked in:Apr2026

Question 31 / 52

Coronary arterial dominance is principally defined by the origin of which artery?

Asked in:Jan2026

Question 32 / 52

Which artery gives important branches to the abdominal oesophagus?

Asked in:Sep2016

Question 33 / 52

An arterial aneurysm compresses the left renal vein from anteriorly where it crosses the aorta. Which artery is involved?

Asked in:Sep2016Apr2017Jan2021

Question 34 / 52

Angiography localises bleeding to a sigmoid-colon arterial branch. Which parent artery supplies it?

Asked in:Session not recorded

Question 35 / 52

After regional perigastric and pancreaticosplenic nodes, gastric fundus lymph ultimately reaches which main pre-aortic group?

Asked in:Jan2017

Question 36 / 52

The inferior mesenteric vein usually drains directly into which vessel?

Asked in:Apr2017Apr2021

Question 37 / 52

Which major vein lies immediately anterior to the medial part of the right adrenal gland?

Asked in:Apr2017

Question 38 / 52

The embryonic midgut rotates around which artery?

Asked in:Jan2018Jan2019Sep2020Jan2021

Question 39 / 52

Which artery principally supplies the proximal two-thirds of the transverse colon?

Asked in:Apr2018Jan2020Apr2021May2022

Question 40 / 52

At the left renal hilum, where does the main renal artery lie relative to the renal vein?

Asked in:Jan2020Undated recall

Question 41 / 52

An IMA occlusion causes no colonic ischaemia because of SMA collateral flow. Which artery is the key contributing branch?

Asked in:Sep2020Undated recall

Question 42 / 52

After bowel infarction, only 5 cm of jejunum remains connected to colon. Which support is essential for long-term nutrition?

Asked in:Apr2021

Question 43 / 52

The anterior and posterior caecal arteries arise from which artery?

Asked in:Sep2021

Question 44 / 52

A persistent vitelline artery supplying a Meckel diverticulum belongs to which arterial system?

Asked in:May2022

Question 45 / 52

Bleeding is proven angiographically to arise from the lower anal canal below the pectinate line. Which artery is the relevant supply?

Asked in:Sep2022

Question 46 / 52

A surgeon follows the vein leaving the inferomedial left adrenal gland. Into which major vein does it usually drain?

Asked in:Sep2022Apr2025

Question 47 / 52

Which gastric region receives short gastric branches from the splenic arterial system?

Asked in:Sep2022Sep 2022 / 2023 ?Jan2024Jan2025

Question 48 / 52

A man develops a left varicocele from obstruction of the vein receiving the left gonadal vein. Which vein is obstructed?

Asked in:Session not recorded

Question 49 / 52

Which vessel is compressed in classical anterior nutcracker syndrome?

Asked in:Jan2023

Question 50 / 52

Physical examination is inconclusive for a suspected varicocele. Which imaging test should be requested first?

Asked in:May2023

Question 51 / 52

Which artery is the principal supply to the upper rectum?

Asked in:Jan2025

Question 52 / 52

Where does the splenic vein run in relation to the pancreatic body?

Asked in:Jan2025

Quiz completed

MRCS Part A — Abdomen & Vessels: High-Yield Revision Notes

Aortic origins and levels

Mesenteric distributions

Anastomoses and watershed zones

Embryology

Splenic artery and vein

Operative injury patterns

Pancreatic relationships

Arterial supply

Clinical and operative contrasts

Portal hypertension

Renal vascular relationships

Venous drainage

Varicocele assessment

Portal vein formation

Portosystemic connections

Clinical distinction

Distinguishing early graft complications

Immediate assessment

Examiner trap

Ischaemia and anatomy

Intestinal failure

After Roux-en-Y bypass

Splenic and lymphatic clinical signs

Nerves and autonomic receptors

Named vessels and plexuses

Examiner trap

Five relationships to memorise

Five core vascular associations

During ligation of the splenic hilar vessels, which structure is most at risk of injury?

Along which border of the pancreas does the splenic artery usually run?

The left testicular vein usually drains into which vessel?

In normal anatomy, the left renal vein crosses the aorta in which position?

Which portal tributary chiefly supplies the portosystemic collateral pathway responsible for lower oesophageal varices?

The main renal arteries usually arise from the aorta near which vertebral level?

A posterior ulcer in the first part of the duodenum causes massive haematemesis. Which artery is most likely eroded?

An ulcer lies near the greater curvature at the body–antrum junction. Which artery is most closely related?

Beta-1 adrenoceptors are particularly prominent in which tissue?

Which structure lies immediately anterior to the main renal artery at the renal hilum?

Which site is the classic watershed between superior and inferior mesenteric arterial territories?

What best explains increased red-cell destruction in hypersplenism?

The right testicular vein usually drains directly into which vessel?

At which vertebral level does the abdominal aorta usually divide into common iliac arteries?

Most anterior nasal septal bleeding arises from which vascular network?

During division of the short gastric vessels at splenectomy, which structure is most at risk of direct injury?

The inferior epigastric vein usually drains into which vein?

Which ligament contains the splenic hilar vessels and pancreatic tail?

If a high vascular tie is chosen during anterior resection, which artery is divided near its aortic origin?

The right gastroepiploic artery normally arises from which vessel?

A patient has iron-deficiency anaemia, weight loss and a hard left supraclavicular node. Which malignancy is classically associated?

Which artery passes anterior to the uncinate process of the pancreas?

The right renal artery passes posterior to which major vessel?

The lateral femoral cutaneous nerve usually arises from which spinal roots?

A renal graft becomes cyanotic minutes after reperfusion; major vessels are patent and preformed donor-reactive antibodies are demonstrated. What is the cause?

Ten days after transplantation, creatinine rises; graft vessels are patent and biopsy shows tubulitis with interstitial T-cell infiltration. What is the diagnosis?

Which artery is the principal named supply to the descending colon?

A renal transplant recipient develops sudden anuria despite a patent urinary catheter. Doppler shows absent main renal arterial and intrarenal perfusion. What is most likely?

Ten days after transplantation, a patient develops graft pain, swelling and anuria. Doppler shows absent renal venous flow with reversed arterial diastolic flow. What is most likely?

A stable patient develops iron-deficiency anaemia after Roux-en-Y gastric bypass despite adequate oral iron. Bleeding has been excluded. What is the best next replacement?

Coronary arterial dominance is principally defined by the origin of which artery?

Which artery gives important branches to the abdominal oesophagus?

An arterial aneurysm compresses the left renal vein from anteriorly where it crosses the aorta. Which artery is involved?

Angiography localises bleeding to a sigmoid-colon arterial branch. Which parent artery supplies it?

After regional perigastric and pancreaticosplenic nodes, gastric fundus lymph ultimately reaches which main pre-aortic group?

The inferior mesenteric vein usually drains directly into which vessel?

Which major vein lies immediately anterior to the medial part of the right adrenal gland?

The embryonic midgut rotates around which artery?

Which artery principally supplies the proximal two-thirds of the transverse colon?

At the left renal hilum, where does the main renal artery lie relative to the renal vein?

An IMA occlusion causes no colonic ischaemia because of SMA collateral flow. Which artery is the key contributing branch?

After bowel infarction, only 5 cm of jejunum remains connected to colon. Which support is essential for long-term nutrition?

The anterior and posterior caecal arteries arise from which artery?

A persistent vitelline artery supplying a Meckel diverticulum belongs to which arterial system?

Bleeding is proven angiographically to arise from the lower anal canal below the pectinate line. Which artery is the relevant supply?

A surgeon follows the vein leaving the inferomedial left adrenal gland. Into which major vein does it usually drain?

Which gastric region receives short gastric branches from the splenic arterial system?

A man develops a left varicocele from obstruction of the vein receiving the left gonadal vein. Which vein is obstructed?

Which vessel is compressed in classical anterior nutcracker syndrome?

Physical examination is inconclusive for a suspected varicocele. Which imaging test should be requested first?