Endocrine Surgery Practice Questions

Q: A 50-year-old male presents with severe dyspnea following thyroid surgery. What is the treatment of choice?

Open the operative site. **Explanation:** The most common cause of acute respiratory distress immediately following thyroid surgery is a **tension hematoma** (post-operative hemorrhage). This occurs due to arterial bleeding (often from the superior thyroid artery) deep to the strap muscles. The accumulation of blood creates pressure that causes venous and lymphatic obstruction, leading to laryngeal edema and compression of the trachea. **Why "Open the operative site" is correct:** This is a surgical emergency. The immediate priority is to **decompress the neck** by opening the surgical incision and the underlying strap muscles at the bedside. This relieves the pressure on the airway, restores venous drainage, and allows the patient to breathe while being prepared for a formal re-exploration in the operating room to achieve definitive hemostasis. **Why other options are incorrect:** * **Tracheostomy:** This is a time-consuming procedure and technically difficult in a neck distorted by a large hematoma. It is not the first-line treatment for acute post-thyroidectomy airway obstruction. * **Cricothyroidotomy:** While an emergency airway procedure, it does not address the underlying cause (compression). Decompressing the hematoma is faster and more effective in this specific scenario. * **Wait and watch:** This is contraindicated as the condition can rapidly progress to total airway occlusion and cardiac arrest. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of post-op dyspnea (0-2 hours):** Tension hematoma. * **Most common cause of post-op dyspnea (after 24 hours):** Hypocalcemia (causing laryngospasm) or bilateral Recurrent Laryngeal Nerve (RLN) injury. * **Management Priority:** Always **Decompress first, Intubate second.** Do not wait for an anesthesiologist or transfer to the OR to open the wound if the patient is in distress.

Q: Which is the least common type of thyroid malignancy?

Anaplastic. **Explanation:** The frequency of thyroid malignancies follows a specific hierarchy based on their cellular origin and differentiation. **Anaplastic thyroid carcinoma (ATC)** is the correct answer as it is the rarest form, accounting for only **1–2%** of all thyroid cancers. It is an undifferentiated tumor, typically presenting in elderly patients as a rapidly enlarging neck mass with early local invasion and a very poor prognosis. **Analysis of Options:** * **A. Papillary (80–85%):** This is the **most common** type of thyroid malignancy. It is associated with radiation exposure and has the best prognosis. Characteristic features include Psammoma bodies and Orphan Annie eye nuclei. * **B. Follicular (10–15%):** The second most common type. It is characterized by hematogenous spread (unlike papillary, which spreads via lymphatics) and requires histological evidence of capsular or vascular invasion for diagnosis. * **C. Medullary (5%):** Arises from the parafollicular C-cells and secretes Calcitonin. It can be sporadic or associated with MEN 2A/2B syndromes. While less common than Papillary or Follicular, it is still more frequent than Anaplastic. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common overall:** Papillary Carcinoma. * **Least Common / Worst Prognosis:** Anaplastic Carcinoma. * **Most Common in Iodine-Deficient areas:** Follicular Carcinoma. * **Tumor Marker for Medullary:** Calcitonin (used for diagnosis and follow-up). * **Diagnosis:** FNAC can diagnose Papillary, Medullary, and Anaplastic, but **cannot** distinguish between Follicular Adenoma and Carcinoma (requires biopsy).

Q: A young girl presented with swelling in the neck which moves on deglutition. She complains of dyspnea and venous engorgement in the face. The clinician performed a test, and the name of this sign is:

Pemberton sign. ### Explanation **1. Why Pemberton Sign is Correct:** The clinical presentation describes a **Retrosternal Goiter**. When a large goiter extends into the superior mediastinum, it can cause a "thoracic inlet syndrome." The **Pemberton sign** is elicited by asking the patient to raise both arms above the head until they touch the sides of the face for 30–60 seconds. * **Mechanism:** This maneuver further narrows the thoracic inlet, causing the goiter to compress the internal jugular and subclavian veins against the clavicles/ribs. * **Clinical Findings:** Facial congestion, cyanosis, respiratory distress (stridor), and prominent neck veins. This confirms the presence of obstructive retrosternal extension. **2. Why the Other Options are Incorrect:** * **Lahey Test:** This is a physical examination technique used to palpate the thyroid gland. The clinician pushes the trachea to one side to make the contralateral lobe more prominent and easier to palpate. * **Crile Test:** Similar to the Lahey test, this involves palpating the thyroid gland by placing the thumb over the thyroid cartilage and asking the patient to swallow to feel for nodules or enlargement. * **Gifford Test:** This is an ocular sign seen in **Graves' ophthalmopathy**, characterized by difficulty in everting the upper eyelid. **3. High-Yield Clinical Pearls for NEET-PG:** * **Retrosternal Goiter Definition:** A goiter where >50% of the mass is below the thoracic inlet. * **Most Common Symptom:** Dyspnea (due to tracheal compression). * **Imaging of Choice:** CT scan (without contrast is preferred if radioactive iodine therapy is planned) to assess the extent of mediastinal involvement. * **Treatment:** Most retrosternal goiters can be removed via a standard cervical incision; a sternotomy is required in less than 5% of cases.

Q: A patient presents with perioral paresthesia following thyroid surgery. Serum calcium levels are 7 mg/dL. What is the most appropriate management?

Oral calcium. **Explanation:** The patient is presenting with **symptomatic hypocalcemia** (perioral paresthesia) following thyroid surgery, a common complication due to transient ischemia or accidental removal of the parathyroid glands. **1. Why Oral Calcium is correct:** The management of post-thyroidectomy hypocalcemia depends on the severity of symptoms and the absolute calcium level. In patients with **mild symptoms** (like isolated perioral paresthesia) and a serum calcium level above 6.5–7.0 mg/dL, **oral calcium supplementation** is the first-line treatment. It is effective, safer than IV administration, and sufficient to alleviate mild neuromuscular irritability. **2. Why other options are incorrect:** * **IV Calcium Gluconate:** This is reserved for **emergency management** of severe hypocalcemia (e.g., tetany, carpopedal spasm, seizures, or QTc prolongation). While the patient is symptomatic, perioral paresthesia alone does not necessitate the risks associated with rapid IV calcium infusion unless oral therapy fails or symptoms progress. * **Oral Vitamin D3 (with or without Calcium):** Vitamin D3 (Cholecalciferol) requires hepatic and renal hydroxylation and has a slow onset of action. In acute post-surgical hypoparathyroidism, **Calcitriol** (active Vitamin D) is preferred over D3 if oral calcium alone is insufficient. **NEET-PG High-Yield Pearls:** * **Most common cause** of post-thyroidectomy hypocalcemia: Devitalization of parathyroid glands. * **Chvostek’s sign:** Tapping the facial nerve leads to facial twitching. * **Trousseau’s sign:** Carpal spasm induced by inflating a BP cuff (more sensitive than Chvostek). * **ECG finding:** Prolonged QT interval. * **Hungry Bone Syndrome:** Severe, prolonged hypocalcemia seen after surgery for hyperparathyroidism (not thyroidectomy).

Q: What is the treatment for localized and well-differentiated carcinoma of the thyroid?

Near total thyroidectomy, radioisotope. **Explanation:** The management of well-differentiated thyroid carcinoma (WDTC), which includes **Papillary** and **Follicular** thyroid cancers, is centered on surgical clearance followed by adjuvant therapy to eliminate microscopic residual disease. **1. Why Option A is Correct:** For localized WDTC, the standard of care is **Near-total thyroidectomy (NTT)** or **Total thyroidectomy (TT)**. NTT involves removing all visible thyroid tissue except for a small amount (<1 gram) near the recurrent laryngeal nerve or parathyroid glands to prevent injury. Following surgery, **Radioactive Iodine (RAI/Radioisotope - I-131)** is administered. RAI serves two purposes: it ablates any remaining thyroid remnant and acts as a diagnostic tool to detect and treat distant metastases. **2. Why Other Options are Incorrect:** * **Option B:** Subtotal thyroidectomy is inadequate for malignancy as it leaves too much tissue behind, making RAI ablation ineffective and increasing recurrence risk. **External Beam Radiation (EBRT)** is not a primary treatment for WDTC; it is reserved for palliative care or unresectable anaplastic cases. * **Option C & D:** These include EBRT. WDTC is highly **radioresistant** to external radiation but **radiosensitive** to internal radioisotopes (I-131). Therefore, EBRT is not part of the standard protocol for localized, well-differentiated disease. **Clinical Pearls for NEET-PG:** * **Thyroglobulin (Tg):** Used as a tumor marker for follow-up *after* total thyroidectomy and ablation. * **McHenry’s Rule:** If the nodule is >1 cm, TT/NTT is preferred; if <1 cm (microcarcinoma) and low risk, hemithyroidectomy may be considered. * **Levothyroxine:** Post-operatively, patients require lifelong TSH suppression therapy (keeping TSH <0.1 mU/L) to prevent stimulation of any dormant cancer cells.

Q: What is the most common site of ectopic pheochromocytoma?

Organ of Zuckerkandl. **Explanation:** Pheochromocytomas are catecholamine-secreting tumors arising from chromaffin cells. While 90% occur in the adrenal medulla, 10% are extra-adrenal, referred to as **paragangliomas**. **1. Why Organ of Zuckerkandl is correct:** The **Organ of Zuckerkandl** is a collection of chromaffin tissue located at the origin of the **inferior mesenteric artery** (near the aortic bifurcation). It is the largest collection of extra-adrenal chromaffin tissue in the body and is the **most common site** for ectopic (extra-adrenal) pheochromocytomas, accounting for approximately 50–75% of such cases. **2. Analysis of Incorrect Options:** * **Bladder:** While the urinary bladder is a well-known site for paragangliomas (often presenting with micturition-induced syncope or palpitations), it is less common than the Organ of Zuckerkandl. * **Filum terminale & Celiac plexus:** These are recognized but rare sites for paragangliomas. The celiac plexus is the second most common abdominal site, but still lags significantly behind the Organ of Zuckerkandl. **3. Clinical Pearls for NEET-PG:** * **The Rule of 10s:** Traditionally, Pheochromocytoma is 10% bilateral, 10% malignant, 10% pediatric, and **10% extra-adrenal**. (Note: Modern genetics suggest up to 30-35% may be hereditary). * **Malignancy Risk:** Extra-adrenal tumors (paragangliomas) have a **higher risk of malignancy** compared to adrenal pheochromocytomas. * **Diagnosis:** Best initial screening test is **24-hour urinary fractionated metanephrines** or plasma free metanephrines. * **Localization:** **MIBG scan** (123I-MIBG) is highly specific for locating ectopic or metastatic sites.

Q: What is true about follicular carcinoma of the thyroid?

More common in endemic areas. **Explanation:** Follicular Thyroid Carcinoma (FTC) is the second most common thyroid malignancy. Understanding its distinct pathological and epidemiological features is crucial for NEET-PG. **1. Why Option A is Correct:** FTC is significantly **more common in iodine-deficient (endemic) areas**. While Papillary carcinoma is the most common thyroid cancer overall, its relative incidence decreases in endemic regions, where FTC can account for up to 25-40% of cases. Chronic TSH stimulation due to low iodine is thought to contribute to its pathogenesis. **2. Why the other options are Incorrect:** * **Option B:** FTC is typically **encapsulated**. Unlike Papillary carcinoma, which is often unencapsulated and multifocal, FTC usually presents as a solitary, well-circumscribed, and encapsulated mass. * **Option C:** The mean age of presentation is usually **50 years** (the 5th decade). It typically presents about 10 years later than Papillary carcinoma (which peaks at 30–40 years). * **Option D:** This is a classic trap. Histopathology **cannot** easily differentiate FTC from a follicular adenoma based on cellular features alone. The diagnosis of malignancy requires the demonstration of **capsular invasion** or **vascular invasion**, which necessitates a formal histopathological examination of the entire capsule. Therefore, **FNAC cannot distinguish between the two.** **Clinical Pearls for NEET-PG:** * **Spread:** FTC spreads primarily via the **hematogenous route** (to lungs and bone), unlike Papillary carcinoma which spreads via lymphatics. * **Diagnosis:** "Follicular neoplasm" on FNAC is an indication for diagnostic lobectomy because cytology cannot assess capsular integrity. * **Hürthle Cell Carcinoma:** A variant of FTC characterized by oxyphilic cells; it is more aggressive and less likely to take up radioactive iodine. * **Molecular Marker:** Often associated with **RAS mutations** or **PAX8-PPARγ rearrangements**.

Question 1

A 50-year-old male presents with severe dyspnea following thyroid surgery. What is the treatment of choice?

Accepted Answer

Open the operative site

Answer

Tracheostomy

Answer

Wait and watch

Answer

Cricothyroidotomy

Question 2

Which is the least common type of thyroid malignancy?

Accepted Answer

Anaplastic

Answer

Papillary

Answer

Follicular

Answer

Medullary

Question 3

Which of the following treatment modalities for papillary carcinoma is obsolete nowadays?

Accepted Answer

Berry picking of involved lymph nodes

Answer

Near total thyroidectomy

Answer

Modified radical neck dissection

Answer

Suppressive lifelong dose of L-thyroxine

Question 4

A young girl presented with swelling in the neck which moves on deglutition. She complains of dyspnea and venous engorgement in the face. The clinician performed a test, and the name of this sign is:

Accepted Answer

Pemberton sign

Answer

Lahey test

Answer

Crile test

Answer

Gifford test

Question 5

A patient presents with perioral paresthesia following thyroid surgery. Serum calcium levels are 7 mg/dL. What is the most appropriate management?

Accepted Answer

Oral calcium

Answer

Oral vitamin D3

Answer

Oral vitamin D3 with calcium

Answer

IV calcium gluconate

Question 6

A 40-year-old male presents with papillary thyroid cancer confined to one lobe of the thyroid, measuring 3x3 cm, with no palpable nodes. What is the ideal treatment?

Accepted Answer

Total thyroidectomy

Answer

Hemithyroidectomy

Answer

Subtotal Thyroidectomy

Answer

Total thyroidectomy with nodal dissection

Question 7

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

Total thyroidectomy with left sided modified neck dissection

Answer

Hemithyroidectomy

Answer

Near total thyroidectomy with radiotherapy

Answer

Hemithyroidectomy with modified neck dissection

Question 8

What is the treatment for localized and well-differentiated carcinoma of the thyroid?

Accepted Answer

Near total thyroidectomy, radioisotope

Answer

Subtotal thyroidectomy with external beam irradiation

Answer

Near total thyroidectomy, iodine, external beam irradiation

Answer

Total thyroidectomy, external beam radiation, lifelong levothyroxine

Question 9

What is the most common site of ectopic pheochromocytoma?

Accepted Answer

Organ of Zuckerkandl

Answer

Bladder

Answer

Filum terminale

Answer

Celiac plexus

Question 10

What is true about follicular carcinoma of the thyroid?

Accepted Answer

More common in endemic areas

Answer

Non-encapsulated

Answer

Mean age of presentation is 40 years

Answer

Histopathology easily differentiates it from an adenoma

Endocrine Surgery — MCQs

Endocrine Surgery — MCQs

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