Surgery MCQs 12

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ENDOCRINE SURGERY • PATHOLOGY

A 74-year-old woman with a long-standing history of Hashimoto’s thyroiditis presents with a rapidly enlarging thyroid swelling (goiter) over a few weeks. She complains of compressive symptoms.

What is the most likely diagnosis?

A Follicular carcinoma

B Papillary carcinoma

C Lymphoma

D Sarcoma

E Medullary carcinoma

C. Lymphoma. The combination of long-standing Hashimoto's thyroiditis and a rapidly enlarging goiter in an elderly patient is a classic presentation for thyroid lymphoma.

Decoding the Stem

1

CLUE "Elderly + Hashimoto’s + Rapid Enlargement"

TRANS Points overwhelmingly to Thyroid Lymphoma.

2

CLUE "Compressive symptoms"

TRANS Indicates mass effect (dyspnea/dysphagia) common in aggressive tumors.

Explanation

C. Lymphoma: Correct. Strongly associated with Hashimoto’s. Chronic lymphocytic inflammation predisposes to B-cell lymphoma transformation. Presents as a rapidly enlarging painless goiter in elderly females.

A. Follicular carcinoma: Incorrect. Characterized by hematogenous spread (bone, lung) but not typically associated with rapid enlargement on a Hashimoto background.

B. Papillary carcinoma: Incorrect. While it is the most common thyroid cancer, it is typically slow-growing with an excellent prognosis; not linked to Hashimoto's in this specific clinical context.

D. Sarcoma: Incorrect. Extremely rare in the thyroid gland and lacks the classic association with autoimmune thyroiditis.

E. Medullary carcinoma: Incorrect. Derived from parafollicular C cells, associated with MEN 2 syndrome, and monitored via calcitonin; unrelated to Hashimoto's.

🧠 High-Yield Pearls

Feature	Clinical Correlation	Significance
Risk Factor	Hashimoto’s Thyroiditis	Autoimmune → B-cell Lymphoma
Growth Rate	Rapid (weeks)	Red flag: Lymphoma vs Anaplastic
Prognosis	Papillary Carcinoma	Best overall prognosis

Integrated Clinical Questions

1. Most common thyroid malignancy overall?

Answer: Papillary carcinoma.

2. Thyroid cancer with best prognosis?

Answer: Papillary carcinoma.

3. Thyroid cancer with worst prognosis (rapid growth)?

Answer: Anaplastic carcinoma.

4. Tumor marker for medullary carcinoma?

Answer: Calcitonin.

5. Spread pattern of follicular carcinoma?

Answer: Hematogenous (bone, lung).

⚡ Exam Pearls

• Hashimoto + rapid goiter = lymphoma until proven otherwise.
• Differentiate: Anaplastic carcinoma vs Lymphoma (both are rapid).
• In elderly: Rapid thyroid swelling is a surgical oncology red flag.
• Background disease gives the clue → Autoimmune → B-cell transformation.

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