Endocrine Surgery Practice Questions

Q: A middle-aged female presented with a solitary thyroid nodule of size 2 cm. What is the next line of management?

Fine Needle Aspiration Cytology (FNAC). **Explanation:** The management of a solitary thyroid nodule (STN) follows a standardized diagnostic algorithm. In a clinically euthyroid patient with a palpable nodule, the **initial investigation of choice is Fine Needle Aspiration Cytology (FNAC)**. **Why FNAC is the Correct Answer:** FNAC is the gold standard for the initial evaluation of thyroid nodules because it is minimally invasive, cost-effective, and has high sensitivity and specificity (approx. 95%) for distinguishing between benign and malignant lesions. The results of the FNAC (categorized by the **Bethesda System**) dictate the subsequent surgical or medical management. **Why Other Options are Incorrect:** * **A. Removal of the nodule:** Simple "nodulectomy" is no longer a standard surgical practice for thyroid lesions due to the risk of recurrence and potential for incomplete clearance of malignancy. * **C & D. Subtotal/Total Thyroidectomy:** Surgery is a **therapeutic** step, not a diagnostic one. Performing a major resection without a tissue diagnosis (FNAC) or radiological assessment (USG) violates the standard of care, as many nodules are benign and do not require surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Best Initial Test:** TSH levels. If TSH is suppressed, the next step is a Radionuclide (Iodine-131) scan to look for a "hot" nodule. * **Investigation of Choice (IOC):** FNAC (if TSH is normal or high). * **Most Accurate Test:** Histopathology (post-surgery). * **Bethesda Category I:** Non-diagnostic; requires a repeat FNAC under USG guidance. * **Limitation of FNAC:** It cannot distinguish between **Follicular Adenoma and Follicular Carcinoma**, as this requires evidence of capsular or vascular invasion seen only on histopathology.

Q: What is the most dangerous complication in a patient who has undergone thyroid surgery and develops a hematoma at the operative site?

Respiratory obstruction. **Explanation:** **1. Why Respiratory Obstruction is Correct:** Post-thyroidectomy hematoma is a surgical emergency. The most dangerous complication is **respiratory obstruction (airway compromise)**. Contrary to common belief, this is not primarily caused by direct tracheal compression by the blood clot. Instead, the hematoma causes **venous and lymphatic congestion**, leading to rapid-onset **laryngeal edema**. This narrows the glottic opening, making it the most immediate life-threatening event. The clinical priority is to immediately open the wound at the bedside to evacuate the clot and relieve pressure. **2. Why Other Options are Incorrect:** * **B. Recurrent Laryngeal Nerve (RLN) Palsy:** While a serious complication leading to hoarseness (unilateral) or airway distress (bilateral), it is usually a result of direct intraoperative trauma or stretching, not typically the primary danger of a postoperative hematoma. * **C. Dysphagia:** Difficulty swallowing may occur due to local pain or edema, but it is never life-threatening in the acute postoperative period compared to airway loss. * **D. Shock:** The thyroid space is relatively small; the volume of blood required to cause hemorrhagic shock is rarely reached before the patient succumbs to airway obstruction. **3. High-Yield Clinical Pearls for NEET-PG:** * **Management:** If a patient develops respiratory distress and a tense neck swelling, the first step is **immediate bedside stitch removal/clot evacuation**, followed by a return to the OR. * **Most common cause of hematoma:** Slippage of a ligature on the **superior thyroid artery**. * **Timing:** Usually occurs within the first **6 to 24 hours** post-surgery. * **Tracheostomy:** Rarely needed if the hematoma is evacuated promptly.

Q: The Pemberton sign is seen in which of the following conditions?

Retrosternal goiter. **Explanation:** **Pemberton’s Sign** is a clinical maneuver used to demonstrate latent superior vena cava (SVC) syndrome, most commonly caused by a **retrosternal goiter**. 1. **Mechanism (Why A is correct):** When a patient with a retrosternal goiter raises both arms above their head (Pemberton maneuver) for 30–60 seconds, the thyroid gland is pulled into the narrow thoracic inlet. This "corks" the inlet, compressing the internal jugular and subclavian veins against the clavicles and first ribs. This leads to facial congestion, cyanosis, inspiratory stridor, and elevated jugular venous pressure (JVP). 2. **Analysis of Incorrect Options:** * **B. Graves Ophthalmopathy:** Characterized by exophthalmos, lid lag, and proptosis due to retro-orbital fat and muscle inflammation, not venous obstruction. * **C. Thyroid Crisis (Storm):** A life-threatening hypermetabolic state presenting with fever, tachycardia, and delirium; it is a functional/metabolic emergency, not a mechanical obstructive one. * **D. Addisonian Crisis:** An acute adrenal insufficiency presenting with hypotension, hyponatremia, and hyperkalemia. **High-Yield Clinical Pearls for NEET-PG:** * **Definition of Retrosternal Goiter:** A goiter where >50% of the thyroid mass is below the plane of the thoracic inlet. * **Most Common Cause:** Extension of a multinodular goiter (MNG). * **Imaging Gold Standard:** CT scan of the neck and thorax is the investigation of choice to assess the extent of the goiter and tracheal deviation. * **Surgical Approach:** Most retrosternal goiters can be removed via a standard **cervical incision**; a sternotomy is required in less than 5% of cases (usually for recurrent or malignant cases).

Q: Long-standing multinodular goiter is most commonly associated with which type of thyroid malignancy?

Follicular carcinoma. **Explanation:** The correct answer is **Follicular Carcinoma (Option A)**. **Why Follicular Carcinoma is correct:** The development of follicular carcinoma is strongly linked to areas of **endemic iodine deficiency** and the presence of **long-standing multinodular goiter (MNG)**. Chronic stimulation of the thyroid gland by elevated TSH levels (due to low iodine) leads to hyperplasia and the formation of nodules. Over time, these hyperplastic nodules can undergo malignant transformation into follicular carcinoma. This is why follicular carcinoma is more prevalent in "goiter belts." **Why other options are incorrect:** * **B. Colloid carcinoma:** This is not a recognized histological type of thyroid malignancy. Colloid nodules are benign features of a multinodular goiter. * **C. Medullary carcinoma:** This arises from the parafollicular C-cells (neuroendocrine cells) and is associated with RET proto-oncogene mutations or MEN 2 syndromes, not with iodine deficiency or long-standing MNG. * **D. Papillary carcinoma:** While this is the **most common** thyroid cancer overall, it is usually associated with radiation exposure and specific genetic mutations (BRAF, RET/PTC). It is more common in iodine-sufficient areas and does not have a primary association with long-standing MNG. **High-Yield Clinical Pearls for NEET-PG:** * **Most common thyroid cancer:** Papillary Carcinoma. * **Cancer associated with Iodine Deficiency/MNG:** Follicular Carcinoma. * **Mode of spread:** Papillary spreads via **Lymphatics**; Follicular spreads via **Blood** (Hematogenous to lungs/bones). * **Psammoma bodies:** Characteristic of Papillary Carcinoma. * **Diagnosis:** Follicular carcinoma **cannot** be diagnosed by FNAC (requires histological evidence of capsular or vascular invasion); Papillary carcinoma **can** be diagnosed by FNAC.

Q: Lateral aberrant thyroid refers to which of the following?

Metastatic foci from primary in thyroid. **Explanation:** The term **"Lateral Aberrant Thyroid"** is a historical misnomer. In the past, it was believed that thyroid tissue found laterally in the neck (outside the midline) represented a developmental anomaly or "rest" of thyroid tissue. However, modern surgical pathology has established that **any thyroid tissue found in the lateral cervical lymph nodes is almost always a metastatic deposit from an occult or overt Papillary Thyroid Carcinoma (PTC).** **Analysis of Options:** * **Option B (Correct):** Metastatic foci from a primary thyroid malignancy (usually Papillary Carcinoma) are the most common cause of lateral thyroid tissue. Even if the primary thyroid gland appears normal on palpation, a microscopic focus is often present. * **Option A (Lingual Thyroid):** This is the most common form of **ectopic thyroid**, resulting from a failure of the thyroid to descend from the foramen caecum. It is located in the midline at the base of the tongue, not laterally. * **Option C (Struma Ovarii):** This is a specialized form of mature cystic teratoma where thyroid tissue makes up more than 50% of the tumor. It is located in the ovary, not the neck. * **Option D (Congenital Thyroid Abnormality):** While ectopic thyroid is a congenital abnormality, "Lateral Aberrant Thyroid" specifically refers to the clinical presentation of metastatic nodes, which is an acquired oncological process rather than a developmental failure. **High-Yield NEET-PG Pearls:** * **Rule of Thumb:** Any lateral neck mass containing thyroid tissue should be considered **metastatic Papillary Thyroid Carcinoma** until proven otherwise. * **Investigation of Choice:** FNAC of the lateral node and Ultrasound of the thyroid gland. * **Most common site of Ectopic Thyroid:** Lingual thyroid (90%). * **Thyroglossal Duct Cyst:** The most common congenital midline neck swelling; it moves upward on protrusion of the tongue.

Q: Which of the following is NOT true about medullary thyroid carcinoma?

It is radiosensitive.. **Explanation:** Medullary Thyroid Carcinoma (MTC) is a unique neuroendocrine tumor derived from the **parafollicular C-cells** of the thyroid gland. These cells originate from the **ultimobranchial body** (neural crest cells) and are responsible for secreting **calcitonin**. 1. **Why Option B is the correct answer (False statement):** MTC is notoriously **radioresistant**. Unlike papillary or follicular thyroid cancers, MTC cells do not concentrate iodine because they are not derived from follicular epithelium. Furthermore, external beam radiation and chemotherapy have very limited efficacy. The primary and most effective treatment is **total thyroidectomy with central compartment neck dissection**. 2. **Analysis of other options:** * **Option A:** Correct. MTC arises from the C-cells (parafollicular cells), which secrete calcitonin. * **Option C:** Correct. A pathognomonic histological feature of MTC is the presence of **amyloid stroma**, which represents deposits of pro-calcitonin. This stains positive with **Congo Red** (showing apple-green birefringence). * **Option D:** Correct. **Calcitonin** is the primary tumor marker used for diagnosis, screening, and monitoring recurrence. **CEA** (Carcinoembryonic Antigen) is also frequently elevated. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** 75% are sporadic; 25% are familial (associated with **MEN 2A and 2B** syndromes due to **RET proto-oncogene** mutations). * **Diagnosis:** Fine Needle Aspiration Cytology (FNAC) is the gold standard. * **Screening:** In familial cases, prophylactic thyroidectomy is recommended based on the specific RET mutation codon. * **Staining:** Positive for Calcitonin, Chromogranin A, and Synaptophysin.

Q: All of the following are true regarding medullary carcinoma of the thyroid except?

It is TSH dependent.. **Explanation:** Medullary Carcinoma of the Thyroid (MCT) is a neuroendocrine tumor arising from the **parafollicular C-cells**, which are derived from the **ultimobranchial body** (neural crest cells). **Why Option C is the Correct Answer (The False Statement):** Unlike papillary and follicular carcinomas, which arise from follicular cells and are regulated by Thyroid Stimulating Hormone (TSH), MCT arises from C-cells. These cells do not possess TSH receptors; therefore, **MCT is TSH-independent**. Consequently, TSH suppression therapy (using Levothyroxine) has no role in the management of MCT. **Analysis of Other Options:** * **Option A:** Total thyroidectomy is the treatment of choice. Because MCT is often multicentric (especially in familial cases) and does not concentrate iodine, aggressive surgical resection and central neck dissection are mandatory. * **Option B:** MCT originates from the **parafollicular cells** (C-cells), which are responsible for secreting calcitonin. * **Option D:** **Calcitonin** is the primary tumor marker for MCT. It is used for diagnosis, screening of family members, and monitoring for postoperative recurrence. **High-Yield Clinical Pearls for NEET-PG:** * **Tumor Marker:** Calcitonin (for diagnosis) and CEA (for prognosis). * **Histology:** Characterized by **amyloid stroma** (stained with Congo Red showing apple-green birefringence). * **Genetics:** 75% are sporadic; 25% are familial (associated with **MEN 2A and 2B** syndromes). All patients with MCT should be screened for **RET proto-oncogene** mutations. * **Prophylaxis:** In MEN 2A/2B, prophylactic total thyroidectomy is recommended based on the specific RET mutation.

Question 1

A middle-aged female presented with a solitary thyroid nodule of size 2 cm. What is the next line of management?

Accepted Answer

Fine Needle Aspiration Cytology (FNAC)

Answer

Removal of the nodule

Answer

Subtotal thyroidectomy

Answer

Total thyroidectomy

Question 2

What is the most dangerous complication in a patient who has undergone thyroid surgery and develops a hematoma at the operative site?

Accepted Answer

Respiratory obstruction

Answer

Recurrent laryngeal nerve palsy

Answer

Dysphagia

Answer

Shock

Question 3

The Pemberton sign is seen in which of the following conditions?

Accepted Answer

Retrosternal goiter

Answer

Graves ophthalmopathy

Answer

Thyroid crisis

Answer

Addisonian crisis

Question 4

Long-standing multinodular goiter is most commonly associated with which type of thyroid malignancy?

Accepted Answer

Follicular carcinoma

Answer

Colloid carcinoma

Answer

Medullary carcinoma

Answer

Papillary carcinoma

Question 5

Lateral aberrant thyroid refers to which of the following?

Accepted Answer

Metastatic foci from primary in thyroid

Answer

Lingual thyroid

Answer

Struma ovarii

Answer

Congenital thyroid abnormality

Question 6

Which of the following is NOT true about medullary thyroid carcinoma?

Accepted Answer

It is radiosensitive.

Answer

It involves the parafollicular cells.

Answer

Amyloid stroma is present.

Answer

There is an elevated level of calcitonin.

Question 7

What is the treatment for a thyrotoxic patient with a nodule?

Accepted Answer

Radiotherapy

Answer

Surgery

Answer

Medical therapy

Answer

Antithyroid drugs followed by surgery

Question 8

Which of the following statements are true regarding papillary carcinoma of the thyroid in comparison to follicular carcinoma of the thyroid?

Accepted Answer

Bilaterality, local recurrence, and increased lymph node metastasis are common

Answer

Male preponderance, bilaterality, and local recurrence are common

Answer

Bilaterality, local recurrence, and increased mortality are common

Answer

Male preponderance, local recurrence, and increased lymph node metastasis are common

Question 9

Which complication following thyroidectomy poses the greatest risk of acute respiratory distress?

Accepted Answer

Bilateral partial damage to the recurrent laryngeal nerve

Answer

Damage to the external laryngeal nerve

Answer

Unilateral complete damage to the recurrent laryngeal nerve

Answer

Unilateral partial damage to the recurrent laryngeal nerve

Question 10

All of the following are true regarding medullary carcinoma of the thyroid except?

Accepted Answer

It is TSH dependent.

Answer

Total thyroidectomy is performed.

Answer

Parafollicular cells are involved.

Answer

Calcitonin is released.

Endocrine Surgery — MCQs

Endocrine Surgery — MCQs

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