Endocrine Surgery Practice Questions

Q: What is the treatment for medullary carcinoma of the thyroid?

Total Thyroidectomy. **Explanation:** Medullary Thyroid Carcinoma (MTC) arises from the **parafollicular C-cells** (derived from the neural crest), which secrete calcitonin. Unlike differentiated thyroid cancers (Papillary or Follicular), MTC does not concentrate iodine and is often multicentric, especially in familial cases (MEN 2A/2B). **Why Total Thyroidectomy is the Correct Choice:** The standard of care for MTC is **Total Thyroidectomy** because the disease is frequently bilateral and multicentric. Since C-cells are distributed throughout both lobes, any remaining thyroid tissue poses a high risk of recurrence. Furthermore, because MTC cells do not take up radioactive iodine (RAI), surgery is the only definitive curative modality; residual disease cannot be "cleaned up" with RAI ablation post-operatively. **Analysis of Incorrect Options:** * **Subtotal/Near-total Thyroidectomy:** These procedures leave behind thyroid tissue. In MTC, this is oncologically inadequate due to the high risk of multicentricity and the inability to use adjuvant RAI. * **Lobectomy:** This is insufficient because MTC is often bilateral (up to 90% in familial cases and 20% in sporadic cases). It is only considered in very rare, incidental micro-medullary cancers, but for exam purposes, Total Thyroidectomy remains the gold standard. **High-Yield Clinical Pearls for NEET-PG:** * **Lymph Node Dissection:** Total thyroidectomy should be accompanied by a **Central Compartment Neck Dissection (Level VI)** because MTC has a high rate of early lymphatic spread. * **Screening:** Always rule out **Pheochromocytoma** (via urinary/plasma metanephrines) before surgery in MTC patients to prevent a hypertensive crisis during anesthesia. * **Tumor Markers:** **Calcitonin** is used for diagnosis and monitoring recurrence; **CEA** is a useful secondary marker for prognosis. * **Genetic Testing:** All patients with MTC should be screened for **RET proto-oncogene** mutations.

Q: Complete resection of the thyroid gland on one side, while leaving less than 1 gram of tissue adjacent to the ligament of berry on the opposite side, is termed?

Near-total thyroidectomy. ### Explanation The correct answer is **Near-total thyroidectomy**. **1. Understanding the Correct Answer** A **Near-total thyroidectomy** involves the total removal of one thyroid lobe (lobectomy) along with the isthmus, and the removal of almost all of the contralateral lobe. A small amount of thyroid tissue (**less than 1 gram or <1 cm**) is intentionally left behind, typically near the **Ligament of Berry** or the superior pole. This is done to protect vital structures, specifically the **Recurrent Laryngeal Nerve (RLN)** and the **parathyroid glands**, while still achieving a near-complete resection of the disease. **2. Analysis of Incorrect Options** * **A. Thyroid lobectomy:** This involves the removal of only one lobe of the thyroid gland, usually along with the isthmus (Hemithyroidectomy). The contralateral lobe remains untouched. * **B. Subtotal thyroidectomy:** In this procedure, a significant portion of thyroid tissue (**4–5 grams**) is left on **both sides** to maintain euthyroid status post-operatively. It is less extensive than a near-total thyroidectomy. * **D. Bilateral lobectomy:** This is a synonymous term for **Total Thyroidectomy**, where both lobes and the isthmus are completely removed, leaving no macroscopic thyroid tissue behind. **3. NEET-PG High-Yield Pearls** * **Total Thyroidectomy** is the treatment of choice for most thyroid malignancies (Papillary/Follicular >1cm) and Medullary Thyroid Carcinoma. * **Hartley-Dunhill Procedure:** This is a specific type of near-total thyroidectomy where a total lobectomy is performed on one side and a subtotal resection on the other. * **Ligament of Berry:** The most common site for RLN injury during thyroid surgery because the nerve often passes through or deep to this ligament. * **Post-op Complication:** The most common cause of hypocalcemia post-thyroidectomy is temporary ischemia to the parathyroid glands.

Q: Which of the following statements is false regarding medullary carcinoma?

It is associated with MEN 1 syndrome.. **Explanation:** Medullary Thyroid Carcinoma (MTC) is a unique thyroid malignancy that arises from the **parafollicular C-cells**. These cells are embryologically derived from the **neural crest** (making Option B true) and are responsible for secreting **Calcitonin**. **Why Option C is the correct (false) statement:** MTC is strongly associated with **MEN 2A and MEN 2B** syndromes, but **not MEN 1**. MEN 1 (Wermer’s Syndrome) typically involves the "3 Ps": Pituitary, Parathyroid, and Pancreatic tumors. In contrast, MEN 2 is characterized by the presence of MTC, Pheochromocytoma, and either Hyperparathyroidism (2A) or Mucosal neuromas/Marfanoid habitus (2B). **Analysis of other options:** * **Option A:** Calcitonin is the primary hormone produced by C-cells. It serves as a highly sensitive **tumor marker** for diagnosis, screening, and monitoring recurrence. * **Option D:** In advanced or metastatic MTC, high levels of circulating calcitonin and other peptides (like prostaglandins or VIP) alter intestinal water and electrolyte transport, leading to **secretory diarrhea**. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Most cases are sporadic, but 20-25% are familial, associated with the **RET proto-oncogene** mutation. * **Pathology:** Characterized by **amyloid stroma** (stained with Congo Red showing apple-green birefringence). * **Spread:** It spreads via both lymphatic and hematogenous routes. * **Surgery:** The treatment of choice is **Total Thyroidectomy** with central compartment neck dissection. It does *not* respond to Radioiodine (I-131) therapy because C-cells do not concentrate iodine.

Q: Which of the following statements is NOT TRUE regarding papillary carcinoma of the thyroid?

Is always unifocal.. **Explanation:** **1. Why Option B is the Correct Answer (The False Statement):** Papillary Thyroid Carcinoma (PTC) is characterized by its **multifocality**. In approximately 20–80% of cases, multiple foci of the tumor are found within the same lobe or the contralateral lobe. This occurs due to intraglandular lymphatic spread rather than independent primary origins. Therefore, the statement that it is "always unifocal" is medically incorrect. **2. Analysis of Other Options:** * **Option A:** FNAC is the gold standard for diagnosing PTC. It reliably identifies characteristic nuclear features such as **Orphan Annie eye nuclei**, intranuclear inclusions, and nuclear grooves. Unlike follicular carcinoma, PTC does not require vascular or capsular invasion for diagnosis. * **Option C:** PTC is a "lymphophile" tumor. Its primary mode of metastasis is via the **lymphatics** to the central (Level VI) and lateral cervical lymph nodes. * **Option D:** While microcarcinomas ( 4 cm, or those with extrathyroidal extension/metastasis, is **Total Thyroidectomy** to facilitate postoperative Radioiodine (RAI) ablation and monitoring of Thyroglobulin levels. **Clinical Pearls for NEET-PG:** * **Most common** type of thyroid malignancy (85%). * **Psammoma bodies** (laminated calcifications) are seen in 50% of cases. * **Prognosis:** Excellent, with a 10-year survival rate >90%. * **Risk Factor:** Prior exposure to ionizing radiation. * **Genetic markers:** *BRAF* mutation (most common) and *RET/PTC* rearrangements.

Q: Lymph node metastasis is least commonly seen with which of the following types of thyroid carcinoma?

Follicular Carcinoma of Thyroid. ### Explanation The correct answer is **Follicular Carcinoma of Thyroid (FTC)**. The fundamental concept here is the **mode of spread** characteristic of different thyroid malignancies. **1. Why Follicular Carcinoma is the correct answer:** Follicular carcinoma is characterized by **hematogenous spread** (via the bloodstream) rather than lymphatic spread. It has a high propensity for angioinvasion, leading to distant metastases in the bones (osteolytic lesions) and lungs. Lymph node involvement in FTC is rare, occurring in less than 10% of cases. **2. Why the other options are incorrect:** * **Papillary Carcinoma (PTC):** This is the most common thyroid cancer and is notorious for **lymphatic spread**. Cervical lymph node involvement is present in approximately 50–70% of cases at the time of diagnosis. * **Medullary Carcinoma (MTC):** Arising from parafollicular C-cells, MTC spreads early to both local and mediastinal lymph nodes. Lymph node metastasis is a hallmark of this condition and significantly impacts prognosis. **Clinical Pearls for NEET-PG:** * **Route of Spread:** Papillary = Lymphatic; Follicular = Hematogenous; Medullary = Both; Anaplastic = Local invasion. * **Diagnosis:** FTC cannot be diagnosed by FNAC because FNAC cannot distinguish between a follicular adenoma and carcinoma. Diagnosis requires histological evidence of **capsular or vascular invasion**. * **Orphan Annie Eyes:** Characteristic nuclear feature of Papillary Carcinoma. * **Psammoma Bodies:** Frequently seen in Papillary Carcinoma, rarely in others. * **Amyloid Stroma:** Pathognomonic for Medullary Carcinoma (stains with Congo Red).

Q: Which of the following statements regarding parathyroid glands is true?

All of the above.. This question tests the surgical anatomy of the parathyroid glands, which is a high-yield topic for NEET-PG due to its clinical importance in thyroid and parathyroid surgeries. ### **Explanation of Options** * **Option A:** The **superior (upper) parathyroid glands** are embryologically derived from the 4th branchial pouch. They are relatively constant in position and are typically located **superior** to the intersection of the inferior thyroid artery (ITA) and the recurrent laryngeal nerve (RLN), usually on the posterior aspect of the upper two-thirds of the thyroid lobe. * **Option B:** While parathyroid glands can be found anywhere from the carotid bifurcation to the mediastinum, the **most common ectopic site** for a parathyroid adenoma is the **paraesophageal** region (posterior to the esophagus or in the tracheoesophageal groove). * **Option C:** The **inferior (lower) parathyroid glands** are derived from the 3rd branchial pouch (along with the thymus). Because they migrate further, their position is more variable. However, when found in their typical location near the lower pole of the thyroid, they are almost always situated **anterior (ventral)** to the recurrent laryngeal nerve. Since all three anatomical statements are surgically accurate, **Option D (All of the above)** is the correct answer. ### **High-Yield Clinical Pearls for NEET-PG** * **The "Rule of RLN":** Superior glands are **posterior/deep** to the RLN; Inferior glands are **anterior/superficial** to the RLN. * **Blood Supply:** Both superior and inferior glands are primarily supplied by the **inferior thyroid artery** (ITA). * **Ectopic Lower Glands:** Because they migrate with the thymus, ectopic lower glands are frequently found in the **anterior mediastinum/thymus**. * **Most common cause of Primary Hyperparathyroidism:** Solitary Adenoma (85%).

Q: Which of the following statements regarding papillary thyroid carcinoma are true?

All of the above.. **Explanation:** Papillary Thyroid Carcinoma (PTC) is the most common malignancy of the thyroid gland, characterized by its indolent course and excellent prognosis. This question tests fundamental epidemiological and surgical principles of PTC. * **Option A (Epidemiology):** PTC accounts for approximately **70-80%** of all thyroid cancers in iodine-sufficient regions like the United States. It is more common in females and often associated with radiation exposure. * **Option B (Surgical Management):** For "minimal" or "micro-papillary" carcinoma (defined as a tumor **<1 cm** confined to the thyroid without extrathyroidal extension or lymph node involvement), a **unilateral lobectomy and isthmus resection** is considered oncologically adequate. This approach minimizes surgical morbidity (recurrent laryngeal nerve injury or hypoparathyroidism) while maintaining excellent survival rates. * **Option C (Pathology):** PTC is notoriously **multicentric**. While clinically apparent multifocality is lower, microscopic examination of the contralateral lobe reveals foci of tumor in **70-80%** of cases. This high rate of multicentricity is a primary argument used by surgeons who advocate for total thyroidectomy in larger tumors (>1-4 cm). Since all three statements are accurate descriptions of the disease's behavior and management, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Hallmark Histology:** Orphan Annie eye nuclei (empty-appearing), Psammoma bodies (laminated calcifications), and nuclear grooves. * **Spread:** Primarily via **lymphatics** (cervical lymphadenopathy is common). * **Prognosis:** Excellent; 10-year survival is >90%. * **Risk Factor:** Childhood neck irradiation is the most significant risk factor. * **Molecular Marker:** **BRAF V600E** mutation is the most common genetic alteration and is associated with a higher risk of recurrence.

Q: Which of the following is NOT a feature of de Quervain's thyroiditis?

Autoimmune in etiology. **Explanation:** **De Quervain’s Thyroiditis** (also known as Subacute Granulomatous Thyroiditis) is primarily a **post-viral inflammatory condition**, not an autoimmune one. It typically follows an upper respiratory tract infection (e.g., Coxsackie, Mumps, or Adenovirus). 1. **Why Option A is correct:** De Quervain’s is triggered by viral pathogens that cause follicular destruction. Unlike Hashimoto’s or Graves' disease, it is **not autoimmune** in etiology. While it is associated with HLA-B35, the underlying mechanism is inflammatory/infectious. 2. **Why Option B is incorrect (as a feature):** This is a slightly tricky distractor. While the question asks for what is *NOT* a feature, Option A is the most definitive "non-feature." However, **TSI** is specifically seen in Graves' disease. In De Quervain's, you see a transient hyperthyroid phase due to the "leakage" of preformed hormones, not due to TSI stimulation. 3. **Why Option C is a feature:** The disease is characteristically **self-limiting**. Most patients return to a euthyroid state within weeks to months after passing through transient hyperthyroid and hypothyroid phases. 4. **Why Option D is a feature:** The hallmark clinical presentation is a **painful, tender thyroid gland** (often radiating to the jaw or ear) accompanied by fever and firm thyroid enlargement. **High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Characterized by **multinucleated giant cells** and granulomas. * **Investigation:** ESR is markedly **elevated** (often >50-100 mm/hr). * **Radioiodine Uptake (RAIU):** Characteristically **low/depressed** during the thyrotoxic phase (due to follicular damage). * **Treatment:** NSAIDs for pain; Steroids if severe; Propropanol for symptomatic thyrotoxicosis. Antithyroid drugs (PTU/Methimazole) are **not** indicated.

Q: What is the indication for surgery in a case of adrenal incidentaloma?

All of the above. An **adrenal incidentaloma** is an adrenal mass (≥1 cm) discovered during imaging for reasons unrelated to suspected adrenal disease. The management goal is to identify lesions that are either **malignant** or **hormonally active**. ### **Explanation of Options:** * **Size > 4–6 cm (Option A):** Size is the most reliable predictor of malignancy. While the exact threshold varies by guideline, a diameter **>4 cm** (or >5 cm in some protocols) significantly increases the risk of adrenocortical carcinoma. Large size is a primary surgical indication regardless of hormonal status. * **Bilateral Adrenal Metastasis (Option B):** While most metastases are managed medically, surgery (adrenalectomy) is indicated for **isolated adrenal metastasis** (especially from lung or renal cell carcinoma) if the primary tumor is controlled and there is no other systemic spread. * **Functional Tumor (Option C):** Any incidentaloma that shows biochemical evidence of hormone overproduction—such as **Pheochromocytoma**, **Cushing’s syndrome** (autonomous cortisol secretion), or **Conn’s syndrome** (Primary Aldosteronism)—requires surgical excision to prevent metabolic and cardiovascular complications. ### **High-Yield Clinical Pearls for NEET-PG:** 1. **Initial Workup:** Every incidentaloma must undergo a **24-hour urinary metanephrine** test (to rule out pheochromocytoma) and a **1 mg Overnight Dexamethasone Suppression Test** (to rule out Cushing’s). 2. **Imaging Characteristics:** A "benign" lesion on CT typically has **low Hounsfield Units (HU 60% at 10-15 mins). 3. **Biopsy Contraindication:** Never perform a Fine Needle Aspiration (FNA) until **Pheochromocytoma is ruled out**, as it can trigger a fatal hypertensive crisis. 4. **Follow-up:** Non-surgical lesions <4 cm should be monitored with repeat imaging at 6–12 months.

Question 1

What is the treatment for medullary carcinoma of the thyroid?

Accepted Answer

Total Thyroidectomy

Answer

Subtotal Thyroidectomy

Answer

Near total Thyroidectomy

Answer

Lobectomy

Question 2

Complete resection of the thyroid gland on one side, while leaving less than 1 gram of tissue adjacent to the ligament of berry on the opposite side, is termed?

Accepted Answer

Near-total thyroidectomy

Answer

Thyroid lobectomy

Answer

Subtotal thyroidectomy

Answer

Bilateral lobectomy

Question 3

Which of the following statements is false regarding medullary carcinoma?

Accepted Answer

It is associated with MEN 1 syndrome.

Answer

Calcitonin serves as a tumor marker.

Answer

It arises from the neural crest.

Answer

Diarrhea is a predominant symptom.

Question 4

Which of the following statements is NOT TRUE regarding papillary carcinoma of the thyroid?

Accepted Answer

Is always unifocal.

Answer

Can be reliably diagnosed using Fine Needle Aspiration Cytology (FNAC).

Answer

Typically spreads to the cervical lymph nodes.

Answer

Requires a total thyroidectomy for large tumors.

Question 5

Lymph node metastasis is least commonly seen with which of the following types of thyroid carcinoma?

Accepted Answer

Follicular Carcinoma of Thyroid

Answer

Papillary Carcinoma of Thyroid

Answer

Medullary Carcinoma of Thyroid

Answer

All of the above

Question 6

What is the appropriate surgical approach for thyroidectomy to remove a thyroid carcinoma with retrosternal extension?

Accepted Answer

Combined cervical and thoracic

Answer

Cervical

Answer

Thoracic

Answer

Thoracoscopic

Question 7

Which of the following statements regarding parathyroid glands is true?

Accepted Answer

All of the above.

Answer

Upper parathyroid glands are located superior to the junction of the inferior thyroid artery and the recurrent laryngeal nerve (RLN).

Answer

The most common location for ectopic parathyroid glands is paraesophageal.

Answer

Lower parathyroid glands are situated anterior to the recurrent laryngeal nerve (RLN).

Question 8

Which of the following statements regarding papillary thyroid carcinoma are true?

Accepted Answer

All of the above.

Answer

Seventy to 80% of new cases of thyroid carcinoma in the United States are of the papillary type.

Answer

Total ipsilateral lobectomy and isthmus resection are adequate therapy for minimal thyroid carcinoma.

Answer

Microscopic evidence of multicentric disease is present in 70% to 80% of cases.

Question 9

Which of the following is NOT a feature of de Quervain's thyroiditis?

Accepted Answer

Autoimmune in etiology

Answer

Thyroid-stimulating immunoglobulin (TSI) mediated

Answer

Tends to regress spontaneously

Answer

Painful and associated with enlargement of the thyroid

Question 10

What is the indication for surgery in a case of adrenal incidentaloma?

Accepted Answer

All of the above

Answer

Size > 5 cm

Answer

Bilateral adrenal metastasis

Answer

Functional tumor

Endocrine Surgery — MCQs

Endocrine Surgery — MCQs

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