Endocrine Surgery Practice Questions

Q: Which type of thyroid carcinoma is most commonly associated with cervical lymphadenopathy?

Papillary carcinoma. **Explanation:** **Papillary Thyroid Carcinoma (PTC)** is the most common thyroid malignancy and is characterized by its **lymphatic route of spread**. Approximately 30–50% of patients present with clinically detectable cervical lymphadenopathy at the time of diagnosis, and microscopic nodal involvement can be found in up to 80% of cases. This predilection for regional lymph nodes (specifically Level VI/central compartment) is a hallmark of PTC. **Analysis of Incorrect Options:** * **Follicular Carcinoma:** This tumor primarily spreads via the **hematogenous route** (bloodstream). It typically metastasizes to distant sites like bones and lungs; cervical lymphadenopathy is rare (seen in <10% of cases). * **Anaplastic Carcinoma:** While it is highly aggressive and causes massive local invasion, it is characterized by rapid growth and distant metastasis. It is less "associated" with isolated cervical lymphadenopathy compared to the classic presentation of PTC. * **Medullary Carcinoma:** This tumor does spread to lymph nodes frequently (around 50%), but since Papillary carcinoma is significantly more common in the general population, PTC remains the most frequent cause of thyroid-related cervical lymphadenopathy encountered in clinical practice. **High-Yield Clinical Pearls for NEET-PG:** * **Psammoma bodies** (calcified laminations) are a characteristic histological feature of Papillary carcinoma. * **Orphan Annie eye nuclei** and **nuclear grooves** are diagnostic hallmarks of PTC. * **Prognosis:** PTC has an excellent prognosis despite frequent nodal involvement. * **Risk Factor:** Prior exposure to ionizing radiation is the most significant risk factor for PTC.

Q: A patient has undergone total thyroidectomy for papillary carcinoma of the thyroid. What is the marker for follow-up of such a patient?

Thyroglobulin. **Explanation:** **Thyroglobulin (Tg)** is the correct answer because it is a protein produced exclusively by follicular cells of the thyroid gland. In a patient who has undergone **total thyroidectomy** (and often radioactive iodine ablation), there should be no remaining thyroid tissue. Therefore, serum thyroglobulin levels should ideally be undetectable. If Tg levels become detectable or rise during follow-up, it serves as a highly sensitive and specific biochemical marker for **recurrent or metastatic disease** in differentiated thyroid cancers (Papillary and Follicular). **Analysis of Incorrect Options:** * **Calcitonin (B):** This is the tumor marker for **Medullary Thyroid Carcinoma (MTC)**, as it is secreted by the parafollicular C-cells. It has no role in monitoring papillary carcinoma. * **TSH (C):** While TSH levels are monitored to ensure adequate suppressive thyroxine therapy (to prevent TSH-mediated stimulation of potential micrometastases), TSH itself is not a marker of the tumor burden or recurrence. * **Serum Iodine Levels (D):** These levels do not correlate with the presence or recurrence of thyroid malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Anti-thyroglobulin antibodies (TgAb):** Always measure TgAb alongside Tg. If antibodies are present, they can falsely lower the Tg reading, making the marker unreliable. * **Stimulated Tg:** Tg is most sensitive when TSH is high (either by stopping thyroxine or giving recombinant TSH). * **Whole Body Scan (WBS):** Often used in conjunction with Tg for initial follow-up to detect iodine-avid metastases. * **Papillary Carcinoma:** The most common thyroid cancer, characterized by **Psammoma bodies** and **Orphan Annie eye nuclei** on histology.

Q: FNAC is least diagnostic in which type of thyroid carcinoma?

Follicular carcinoma. **Explanation:** The correct answer is **Follicular Carcinoma (Option C)**. The primary limitation of Fine Needle Aspiration Cytology (FNAC) in thyroid pathology is its inability to distinguish between a **Follicular Adenoma** and a **Follicular Carcinoma**. This is because the diagnosis of malignancy in follicular lesions depends on identifying **capsular invasion** or **vascular invasion**, which are architectural features that can only be seen on formal histopathology (biopsy) and not on a cytological smear. FNAC only provides cellular detail, not tissue architecture. **Analysis of other options:** * **Anaplastic Carcinoma (A):** FNAC is highly diagnostic as it shows overt features of malignancy, such as extreme pleomorphism, giant cells, and spindle cells. * **Papillary Carcinoma (B):** This is the most common thyroid cancer and is easily diagnosed via FNAC based on characteristic nuclear features: Orphan Annie eye nuclei, intranuclear inclusions, and nuclear grooves. * **Thyroiditis (D):** Conditions like Hashimoto’s thyroiditis show distinct cytological patterns (Hürthle cells and lymphocytic infiltration), making FNAC a reliable tool for diagnosis. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard:** Histopathology (Lobectomy/Thyroidectomy) is the only way to confirm Follicular Carcinoma. * **Bethesda System:** Follicular lesions are usually reported as "Follicular Neoplasm" (Bethesda Category IV), carrying a 15–30% risk of malignancy. * **Hürthle Cell Carcinoma:** Like follicular carcinoma, it also cannot be diagnosed by FNAC alone. * **Psammoma Bodies:** Highly suggestive of Papillary Thyroid Carcinoma on FNAC.

Q: Which of the following statements regarding insulinoma is true?

Surgical therapy is indicated if diagnosed. **Explanation:** Insulinoma is the most common functional neuroendocrine tumor (NET) of the pancreas, arising from the beta cells of the islets of Langerhans. **Why Option C is Correct:** Surgical therapy is the **treatment of choice** for insulinoma once diagnosed. Because these tumors are usually small, solitary, and benign (90%), surgical resection (enucleation or partial pancreatectomy) is curative in the vast majority of cases. Medical management (e.g., Diazoxide, Octreotide) is typically reserved for preoperative stabilization or inoperable metastatic disease. **Analysis of Incorrect Options:** * **Option A (Present in pancreas):** While insulinomas are indeed located in the pancreas, this is a statement of anatomical location rather than a definitive clinical rule for the question's context. In competitive exams, the "most true" statement regarding management often takes precedence. * **Option B (Mostly malignant):** This is incorrect. Insulinomas follow the **"Rule of 10s"**: only 10% are malignant, 10% are multiple, and 10% are associated with MEN-1 syndrome. 90% are benign. * **Option D (Present in Bile):** This is factually incorrect; insulinomas are intrapancreatic and do not occur in the biliary tree. **High-Yield Clinical Pearls for NEET-PG:** * **Whipple’s Triad:** Diagnostic hallmark consisting of (1) Symptoms of hypoglycemia during fasting, (2) Low blood glucose (<50 mg/dL), and (3) Relief of symptoms after glucose administration. * **Diagnosis:** The gold standard is the **72-hour supervised fast** (elevated insulin and C-peptide levels despite hypoglycemia). * **Localization:** Intraoperative ultrasound (IOUS) is the most sensitive method for locating the tumor during surgery. * **Association:** If multiple, suspect **MEN-1 syndrome** (3Ps: Pituitary, Parathyroid, Pancreas).

Q: Parathyroid auto-transplantation is performed in which of the following muscles?

Brachioradialis. **Explanation:** Parathyroid auto-transplantation is a standard procedure performed during total parathyroidectomy (e.g., for secondary hyperparathyroidism) or when a healthy parathyroid gland is inadvertently devascularized during thyroid surgery. **Why Brachioradialis is the Correct Answer:** The **Brachioradialis muscle** of the non-dominant forearm is the preferred site for auto-transplantation. The gland is minced into 1-mm fragments and placed into small muscular pockets. This site is chosen because: 1. **Accessibility:** It is easily accessible under local anesthesia if a recurrence occurs. 2. **Monitoring:** It allows for the **Casanova Test** (differential venous sampling). By sampling blood from both arms, clinicians can determine if recurrent hypercalcemia is due to the transplanted tissue (higher PTH in the grafted arm) or an ectopic gland in the neck/mediastinum. 3. **Safety:** It avoids the morbidity of a repeat neck exploration. **Why Other Options are Incorrect:** * **Biceps and Triceps:** While these are large muscles, they are deeper and less peripheral than the brachioradialis, making surgical re-exploration and venous sampling more complex. * **Sartorius:** This is located in the thigh. While the **Sternocleidomastoid (SCM)** is a common alternative site in the neck, the lower limb is rarely used because it lacks the ease of venous monitoring provided by the forearm. **High-Yield Clinical Pearls for NEET-PG:** * **Alternative Site:** If the forearm is not used, the **Sternocleidomastoid (SCM)** is the second most common site (often used during thyroidectomy). * **Cryopreservation:** Excess parathyroid tissue can be cryopreserved for up to 18 months if the initial graft fails. * **Indications:** Most commonly performed in **MEN 1, MEN 2A**, and **Secondary Hyperparathyroidism** (Renal Osteodystrophy). * **Success Rate:** The graft usually begins functioning within 4–6 weeks.

Q: Complications of Hemithyroidectomy include all of the following except?

Hypocalcemia. **Explanation:** The correct answer is **Hypocalcemia**. **1. Why Hypocalcemia is the correct answer:** Hypocalcemia occurs due to hypoparathyroidism, which results from the accidental removal or devascularization of the parathyroid glands. Humans typically have four parathyroid glands (two on each side). In a **hemithyroidectomy**, only one lobe of the thyroid is removed, leaving the two parathyroid glands on the contralateral side intact. These remaining glands are sufficient to maintain normal serum calcium levels. Therefore, clinically significant hypocalcemia is a complication of total or completion thyroidectomy, but not hemithyroidectomy. **2. Analysis of incorrect options:** * **Wound Hematoma:** This is a potential complication of *any* neck surgery. It is life-threatening if it causes airway compression (tension hematoma), regardless of whether the resection was unilateral or bilateral. * **Recurrent Laryngeal Nerve (RLN) Palsy:** The RLN runs in the tracheoesophageal groove on both sides. During a hemithyroidectomy, the nerve on the operative side is at risk of injury, leading to hoarseness. * **External Branch of Superior Laryngeal Nerve (EBSLN) Palsy:** This nerve travels close to the superior thyroid artery. Injury during ligation of the superior pole vessels on the operative side can occur, resulting in loss of high-pitched voice and vocal fatigue. **Clinical Pearls for NEET-PG:** * **Most common cause of hypocalcemia post-thyroidectomy:** Accidental trauma or ischemia to parathyroid glands. * **Most common nerve injured in thyroid surgery:** EBSLN (often under-diagnosed); however, RLN injury is more clinically significant. * **Emergency management of post-op hematoma:** Immediate bedside evacuation of the clot (opening the sutures) to relieve airway obstruction, followed by formal exploration in the OR.

Q: What is the minimum size threshold for operating on a non-functioning adrenal tumor?

4 cm. **Explanation:** The management of an adrenal incidentaloma (a non-functioning tumor discovered accidentally) is primarily guided by the risk of malignancy. The correct threshold for surgical intervention in a non-functioning tumor is **4 cm**. **1. Why 4 cm is the Correct Answer:** The risk of **Adrenocortical Carcinoma (ACC)** increases significantly with size. Studies show that tumors 4 cm have a significantly higher risk. Therefore, the standard surgical guideline (supported by AACE/AAES) recommends that non-functioning masses ≥4 cm should be surgically excised (usually via laparoscopic or open adrenalectomy) to prevent missing a potential malignancy. **2. Why Other Options are Incorrect:** * **1 cm & 2 cm:** These are considered small incidentalomas. If they are non-functional (determined by biochemical screening) and have benign imaging characteristics (low Hounsfield units on CT), they are managed conservatively with serial imaging. * **3 cm:** While some surgeons may consider surgery at 3 cm if the tumor shows rapid growth or suspicious radiological features, it is not the standard threshold for an asymptomatic, non-functioning mass. **Clinical Pearls for NEET-PG:** * **Biochemical Screening:** Every adrenal incidentaloma, regardless of size, must be screened for functionality (Rule out Pheochromocytoma, Cushing’s, and Conn’s syndrome). * **Imaging Characteristics:** A "benign" tumor on CT typically has ** 50% contrast washout at 10 minutes. * **Biopsy Contraindication:** Never biopsy an adrenal mass until **Pheochromocytoma** is ruled out, as it can trigger a fatal hypertensive crisis. * **Growth Rate:** If a tumor grows >0.5 cm in 6 months or >1 cm in a year, surgery is indicated regardless of the initial size.

Question 1

Which type of thyroid carcinoma is most commonly associated with cervical lymphadenopathy?

Accepted Answer

Papillary carcinoma

Answer

Follicular carcinoma

Answer

Anaplastic carcinoma

Answer

Medullary carcinoma

Question 2

A patient has undergone total thyroidectomy for papillary carcinoma of the thyroid. What is the marker for follow-up of such a patient?

Accepted Answer

Thyroglobulin

Answer

Calcitonin

Answer

TSH

Answer

Serum iodine levels

Question 3

FNAC is least diagnostic in which type of thyroid carcinoma?

Accepted Answer

Follicular carcinoma

Answer

Anaplastic carcinoma

Answer

Papillary carcinoma

Answer

Thyroiditis

Question 4

Which of the following statements regarding insulinoma is true?

Accepted Answer

Surgical therapy is indicated if diagnosed

Answer

Present in pancreas

Answer

Mostly malignant

Answer

Present in Bile

Question 5

Parathyroid auto-transplantation is performed in which of the following muscles?

Accepted Answer

Brachioradialis

Answer

Biceps

Answer

Triceps

Answer

Sartorius

Question 6

Complications of Hemithyroidectomy include all of the following except?

Accepted Answer

Hypocalcemia

Answer

Wound hematoma

Answer

Recurrent laryngeal nerve palsy

Answer

External branch of superior laryngeal nerve palsy

Question 7

The triad originally described for Zollinger-Ellison syndrome is characterized by?

Accepted Answer

Peptic ulceration, gastric hypersecretion, non-beta cell tumor

Answer

Peptic ulceration, gastric hypersecretion, beta cell tumor

Answer

Peptic ulceration, achlorhydria, non-beta cell tumor

Answer

Peptic ulceration, achlorhydria, beta cell tumor

Question 8

Which of the following are characteristic features of papillary carcinoma of the thyroid?

Accepted Answer

Blood borne metastasis is common

Answer

Most common thyroid cancer

Answer

Psammoma bodies seen

Answer

Encapsulated

Question 9

What is the minimum size threshold for operating on a non-functioning adrenal tumor?

Accepted Answer

4 cm

Answer

1 cm

Answer

2 cm

Answer

3 cm

Question 10

Which of the following statements is NOT true regarding medullary carcinoma of the thyroid?

Accepted Answer

Fine needle aspiration cytology (FNAC) cannot be used for diagnosis.

Answer

Metastases to bone are osteoblastic.

Answer

Carcinoembryonic antigen is a better predictor of prognosis compared to calcitonin.

Answer

Medullary carcinomas of the thyroid are not hormone dependent.

Endocrine Surgery — MCQs

Endocrine Surgery — MCQs

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