Endocrine Surgery Practice Questions

Q: A 52-year-old female presents with symptoms of pheochromocytoma and also has a thyroid carcinoma. What type of thyroid carcinoma does she likely have?

Medullary. **Explanation:** The correct answer is **Medullary Thyroid Carcinoma (MTC)**. This clinical presentation is a classic description of **Multiple Endocrine Neoplasia (MEN) Type 2** syndromes. **Why Medullary is correct:** The association of Pheochromocytoma and Thyroid Carcinoma is the hallmark of **MEN 2A (Sipple Syndrome)** and **MEN 2B**. * **MEN 2A:** Medullary Thyroid Carcinoma (100%), Pheochromocytoma (50%), and Parathyroid Hyperplasia (20%). * **MEN 2B:** Medullary Thyroid Carcinoma, Pheochromocytoma, Marfanoid habitus, and Mucosal neuromas. MTC arises from the parafollicular C-cells (which produce calcitonin) and is the only thyroid cancer linked to these genetic syndromes via the **RET proto-oncogene**. **Why other options are incorrect:** * **Papillary Carcinoma (D):** The most common thyroid cancer, but it is associated with radiation exposure and *not* with pheochromocytoma. * **Follicular Carcinoma (C):** Associated with iodine deficiency and hematogenous spread; it does not occur as part of MEN syndromes. * **Anaplastic Carcinoma (A):** A highly aggressive, undifferentiated tumor seen in elderly patients, unrelated to catecholamine-secreting tumors. **High-Yield Clinical Pearls for NEET-PG:** 1. **Rule of Surgery:** In a patient with both MTC and Pheochromocytoma, **always operate on the Pheochromocytoma first** to prevent a hypertensive crisis during thyroid surgery. 2. **Screening:** All patients with MTC should be screened for the **RET mutation** and co-existing pheochromocytoma (via urinary/plasma metanephrines). 3. **Tumor Marker:** Calcitonin is the specific marker for MTC diagnosis and post-operative surveillance. 4. **Prophylaxis:** Total thyroidectomy is recommended for family members carrying the RET mutation.

Q: All are true about pheochromocytoma, except:

90% are malignant. **Explanation:** Pheochromocytoma is a catecholamine-secreting tumor arising from the chromaffin cells of the adrenal medulla. The correct answer is **Option A** because it follows the classic **"Rule of 10s,"** which states that only **10% of pheochromocytomas are malignant**, while 90% are benign. **Analysis of Options:** * **Option A (Incorrect Statement/Correct Answer):** As per the Rule of 10s, 10% are malignant, 10% are bilateral, 10% are extra-adrenal, and 10% occur in children. * **Option B (True):** Approximately 95% of these tumors occur within the abdomen (90% in the adrenal medulla and the remainder in extra-adrenal sites like the Organ of Zuckerkandl). * **Option C (True):** These tumors characteristically secrete catecholamines (Norepinephrine > Epinephrine), leading to the classic triad of episodic headache, sweating, and tachycardia. * **Option D (True):** Extra-adrenal pheochromocytomas (paragangliomas) arise from the sympathetic ganglion chain. **NEET-PG High-Yield Clinical Pearls:** 1. **Diagnosis:** The most sensitive initial screening test is **plasma free metanephrines**. The most specific test is **24-hour urinary metanephrines/catecholamines**. 2. **Localization:** CT/MRI are first-line. For functional localization (especially in extra-adrenal or metastatic cases), **123I-MIBG scan** or **68Ga-DOTATATE PET/CT** is used. 3. **Pre-operative Management:** Always follow the sequence: **Alpha-blockade first** (e.g., Phenoxybenzamine) for 7–14 days, followed by **Beta-blockade** to prevent a hypertensive crisis. 4. **Genetic Associations:** Frequently associated with **MEN 2A/2B**, von Hippel-Lindau (VHL) syndrome, and Neurofibromatosis type 1 (NF1).

Q: Papillary carcinoma of the thyroid usually presents as:

Single nodule with local lymph node involvement. **Explanation:** **Papillary Thyroid Carcinoma (PTC)** is the most common malignancy of the thyroid gland (approx. 80%). Its hallmark clinical presentation is a **slow-growing, painless solitary thyroid nodule**. Unlike other thyroid cancers, PTC is highly **lymphophilic**. It spreads primarily via the lymphatic system to the central (Level VI) and lateral neck nodes. Consequently, at the time of diagnosis, approximately 30–50% of adults (and up to 80% of children) already have clinically palpable or ultrasound-detectable **cervical lymphadenopathy**. **Analysis of Options:** * **Option D (Correct):** Accurately reflects the classic presentation of a dominant single nodule associated with regional lymph node involvement. * **Option A:** Diffuse nodular swelling is more characteristic of Multinodular Goiter (MNG) or Hashimoto’s thyroiditis, though PTC can occasionally arise within an MNG. * **Option B:** While "lateral aberrant thyroid" (lymph node metastasis) can be the first sign, it is rarely the *only* finding; a primary thyroid nodule is almost always present upon careful imaging. * **Option C:** PTC is a non-functional tumor. Patients are typically **euthyroid**. Hormonal disturbances (hyperthyroidism) are more suggestive of toxic nodules or Graves' disease. **High-Yield Clinical Pearls for NEET-PG:** * **Microscopic Hallmark:** Psammoma bodies (calcified laminated bodies) and "Orphan Annie eye" nuclei (empty-appearing nuclei). * **Risk Factor:** Prior exposure to ionizing radiation. * **Prognosis:** Excellent, with a 10-year survival rate >90%. * **Diagnosis:** Fine Needle Aspiration Cytology (FNAC) is the investigation of choice (Note: FNAC cannot distinguish Follicular Adenoma from Carcinoma, but it is definitive for Papillary).

Q: All of the following are complications of total thyroidectomy, EXCEPT:

Hypercalcemia. ### Explanation The correct answer is **C. Hypercalcemia**. **1. Why Hypercalcemia is the correct answer:** Total thyroidectomy involves the removal of the entire thyroid gland. The parathyroid glands, which regulate calcium levels, are located on the posterior surface of the thyroid. During surgery, these glands may be accidentally removed, devascularized, or suffer from temporary ischemia. This leads to **Hypocalcemia** (low calcium), not hypercalcemia. Post-operative hypocalcemia is, in fact, the most common metabolic complication following total thyroidectomy. **2. Why the other options are incorrect:** * **Hemorrhage (A):** Thyroid surgery is highly vascular. A "tension hematoma" can develop post-operatively, which is a surgical emergency. * **Hoarseness (B):** This occurs due to injury to the **Recurrent Laryngeal Nerve (RLN)**. Unilateral injury causes hoarseness, while bilateral injury can cause life-threatening airway obstruction. * **Airway Obstruction (D):** This can be caused by several factors: a compressive hematoma, bilateral RLN palsy, or **Tracheomalacia** (softening of tracheal rings due to long-standing large goiters). **3. Clinical Pearls for NEET-PG:** * **Most common complication overall:** Hypocalcemia (transient in 20%, permanent in <2%). * **Most common cause of immediate post-op respiratory distress:** Tension hematoma (Treatment: Immediate bedside stitch removal/evacuation). * **Nerve injury:** Injury to the **External Branch of the Superior Laryngeal Nerve** leads to loss of high-pitched voice (inability to hit high notes) due to cricothyroid muscle paralysis. * **Chvostek’s and Trousseau’s signs:** Clinical markers for latent hypocalcemia post-thyroidectomy.

Q: A 40-year-old female presents with neck swelling. Examination reveals a 2x2 cm nodule on the right lobe of the thyroid with no palpable cervical nodes. FNAC shows features of papillary carcinoma. What is the treatment of choice?

Total thyroidectomy. **Explanation:** The management of Papillary Thyroid Carcinoma (PTC) is a high-yield topic for NEET-PG. According to the current American Thyroid Association (ATA) and British Thyroid Association (BTA) guidelines, the surgical approach is determined by the size of the nodule and risk factors. **1. Why Total Thyroidectomy is correct:** For a 2 cm (2x2 cm) papillary carcinoma, **Total Thyroidectomy** is the treatment of choice. While some guidelines allow for lobectomy in low-risk tumors between 1–4 cm, in the context of Indian competitive exams (NEET-PG/INI-CET), any PTC **>1 cm**, or those with bilateral disease, extrathyroidal extension, or metastases, warrants a Total Thyroidectomy. This procedure facilitates the use of Radioiodine (RAI) ablation post-operatively and allows for the use of Serum Thyroglobulin as a highly sensitive tumor marker for follow-up. **2. Why other options are incorrect:** * **Right Hemithyroidectomy:** This is generally reserved for "Microcarcinomas" (PTC <1 cm) confined to one lobe without high-risk features. For a 2 cm lesion, it increases the risk of recurrence and complicates follow-up. * **Hartley-Dunhill Operation:** This involves a total lobectomy on one side and a subtotal lobectomy on the other. It is an obsolete procedure for malignancy as it leaves behind significant thyroid tissue, making RAI therapy ineffective. * **Subtotal Thyroidectomy:** This leaves 4–6 grams of tissue on both sides. It is contraindicated in thyroid malignancy due to high recurrence rates and the inability to monitor recurrence via Thyroglobulin. **Clinical Pearls for NEET-PG:** * **Most common thyroid cancer:** Papillary Carcinoma (80-85%). * **Characteristic FNAC findings:** Orphan Annie eye nuclei, Psammoma bodies, and Nuclear grooves. * **Lymphatic spread:** PTC primarily spreads via lymphatics (Level VI nodes first). * **Prognosis:** Excellent; the 10-year survival rate is >90%.

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.

Question 1

A 52-year-old female presents with symptoms of pheochromocytoma and also has a thyroid carcinoma. What type of thyroid carcinoma does she likely have?

Accepted Answer

Medullary

Answer

Anaplastic

Answer

Follicular

Answer

Papillary

Question 2

Which of the following is an unusual presentation of papillary carcinoma of the thyroid?

Accepted Answer

Single nodule with local lymph node enlargement

Answer

Diffuse nodular swelling

Answer

Only lymphadenopathy

Answer

Hormonal disturbance

Question 3

All are true about pheochromocytoma, except:

Accepted Answer

90% are malignant

Answer

95% occur in the abdomen

Answer

They secrete catecholamines

Answer

They arise from sympathetic ganglions

Question 4

Papillary carcinoma of the thyroid usually presents as:

Accepted Answer

Single nodule with local lymph node involvement

Answer

Diffuse nodular swelling

Answer

Only lymphadenopathy

Answer

Hormonal disturbance

Question 5

A 26-year-old woman presents with a palpable thyroid nodule. Needle biopsy demonstrates amyloid in the stroma of the lesion. A cervical lymph node is palpable on the same side as the lesion. What is the preferred treatment?

Accepted Answer

Total thyroidectomy and modified neck dissection on the side of the enlarged lymph node.

Answer

Removal of the involved node, the isthmus, and the enlarged lymph node.

Answer

Removal of the involved lobe, the isthmus, a portion of the opposite lobe, and the enlarged lymph node.

Answer

Total thyroidectomy and irradiation of the cervical lymph nodes.

Question 6

All of the following are complications of total thyroidectomy, EXCEPT:

Accepted Answer

Hypercalcemia

Answer

Hemorrhage

Answer

Hoarseness

Answer

Airway obstruction

Question 7

A 40-year-old female presents with neck swelling. Examination reveals a 2x2 cm nodule on the right lobe of the thyroid with no palpable cervical nodes. FNAC shows features of papillary carcinoma. What is the treatment of choice?

Accepted Answer

Total thyroidectomy

Answer

Right hemithyroidectomy

Answer

Hartley-Dunhill operation

Answer

Subtotal thyroidectomy

Question 8

A 2 cm nodule in the left thyroid is diagnosed as papillary carcinoma. What is the treatment of choice?

Accepted Answer

Total thyroidectomy

Answer

Hemithyroidectomy

Answer

Thyroidectomy with radical neck dissection

Answer

Radiotherapy

Question 9

What is the best treatment for a 2 cm thyroid nodule in a 50-year-old man, where Fine Needle Aspiration Cytology (FNAC) reveals papillary carcinoma?

Accepted Answer

Near total thyroidectomy with central neck dissection

Answer

Hemithyroidectomy

Answer

Subtotal thyroidectomy with modified neck dissection

Answer

Hemithyroidectomy with modified neck dissection

Question 10

What is the treatment for medullary carcinoma of the thyroid?

Accepted Answer

Total Thyroidectomy

Answer

Subtotal Thyroidectomy

Answer

Near total Thyroidectomy

Answer

Lobectomy

Endocrine Surgery — MCQs

Endocrine Surgery — MCQs

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