Endocrine Surgery Practice Questions

Q: Which of the following statements regarding follicular cell carcinoma of the thyroid is true?

Hematogenous spread. **Follicular Thyroid Carcinoma (FTC)** is the second most common thyroid malignancy. Understanding its unique pathological behavior is crucial for NEET-PG. ### **Explanation of the Correct Option** * **A. Hematogenous spread:** Unlike Papillary Thyroid Carcinoma (PTC), which primarily spreads via the lymphatic system, FTC characteristically spreads via the **bloodstream (hematogenous)**. This occurs because the tumor cells invade thin-walled blood vessels. Consequently, distant metastases to the **lungs and bones** (often osteolytic) are more common than regional lymph node involvement. ### **Why the Other Options are Incorrect** * **B. Commonly multifocal:** FTC is typically a **solitary, encapsulated lesion**. Multifocality is a hallmark of Papillary Thyroid Carcinoma (PTC). * **C. Readily diagnosed by FNAC:** This is a classic "trap" question. FNAC **cannot** distinguish between a benign Follicular Adenoma and a malignant Follicular Carcinoma. Both show follicular cells on cytology. The diagnosis of malignancy requires histological evidence of **capsular or vascular invasion**, which can only be seen on a formal biopsy/resection. * **D. Most common carcinoma:** **Papillary Thyroid Carcinoma (PTC)** is the most common thyroid cancer (approx. 80-85%), whereas FTC accounts for about 10-15%. ### **High-Yield Clinical Pearls for NEET-PG** * **Risk Factor:** More common in **iodine-deficient** areas (unlike PTC, which is associated with radiation and iodine excess). * **Hürthle Cell Carcinoma:** A variant of FTC; it is more aggressive, less likely to take up radioactive iodine, and more likely to spread to lymph nodes. * **Molecular Marker:** Often associated with **RAS mutations** or **PAX8-PPARγ rearrangements**. * **Treatment:** Total thyroidectomy followed by Radioactive Iodine (RAI) ablation, as FTC cells usually retain the ability to concentrate iodine.

Q: What is the treatment for a brown tumor?

Parathyroidectomy. **Explanation:** A **Brown tumor** (osteitis fibrosa cystica) is not a true neoplasm but a reactive bone lesion caused by **Primary Hyperparathyroidism (PHPT)**. The underlying pathophysiology involves excessive secretion of Parathyroid Hormone (PTH), which stimulates osteoclastic activity. This leads to bone resorption and the replacement of marrow with vascular fibrous tissue and giant cells. The "brown" color is due to hemosiderin deposition from micro-hemorrhages. **Why Parathyroidectomy is the correct answer:** The definitive treatment for a brown tumor is addressing the source of excess PTH. Once the offending parathyroid adenoma or hyperplasia is surgically removed (**Parathyroidectomy**), PTH levels normalize, and the brown tumor typically undergoes spontaneous regression and mineralization over several months. **Why other options are incorrect:** * **A & B (Curettage/Surgical enucleation):** These are local treatments for true bone tumors (like Giant Cell Tumors). In the case of a brown tumor, local surgery is unnecessary and carries a risk of recurrence if the systemic hyperparathyroidism is not corrected. * **C (Intralesional steroids):** These are sometimes used for aneurysmal bone cysts or giant cell granulomas but have no role in treating the metabolic bone disease of hyperparathyroidism. **NEET-PG High-Yield Pearls:** * **Radiological Hallmark:** Subperiosteal bone resorption, most commonly seen on the **radial aspect of the middle phalanges**. * **Skull finding:** "Salt and pepper" appearance. * **Biochemical profile:** Elevated Serum Calcium, Elevated PTH, and Low Serum Phosphate. * **Differential Diagnosis:** Histologically, brown tumors are indistinguishable from **Giant Cell Tumors (GCT)**; always check serum calcium/PTH to differentiate.

Q: All are true about the effect of thymectomy, EXCEPT:

Hypogammaglobulinemia usually responds to thymectomy.. ### Explanation **1. Why Option B is the Correct Answer (The Exception):** Hypogammaglobulinemia associated with a thymoma is known as **Good’s Syndrome**. This is a rare paraneoplastic syndrome characterized by thymoma, low circulating B-cells, and hypogammaglobulinemia. Unlike Myasthenia Gravis (MG), the immune deficiency in Good’s Syndrome is **not reversed by thymectomy**. Patients remain at high risk for recurrent infections and usually require lifelong intravenous immunoglobulin (IVIG) replacement. **2. Analysis of Other Options:** * **Option A:** Pure Red Cell Aplasia (PRCA) is associated with thymoma in about 5% of cases. Surgical removal of the thymus leads to hematologic remission in approximately **30-50%** of these patients. * **Option C:** This is a classic high-yield statistic. Approximately **10-15% of patients with MG** have an underlying thymoma. Conversely, about 30-45% of patients with a thymoma will have MG. * **Option D:** While thymectomy is more urgently indicated in thymoma (due to malignant potential), the **neuromuscular course of MG** (severity of weakness and response to medical therapy) does not differ significantly between those with a thymoma and those with non-thymomatous lymphoid hyperplasia. **3. Clinical Pearls for NEET-PG:** * **Most common mediastinal tumor:** Thymoma (specifically in the anterior mediastinum). * **Indications for Thymectomy in MG:** All patients with thymoma; and patients without thymoma who are between puberty and age 60 with generalized symptoms. * **Good’s Syndrome Triad:** Thymoma + Hypogammaglobulinemia + Low B-cells (Thymectomy does *not* help the B-cell count). * **Post-operative care:** Patients with MG are at risk of "Myasthenic Crisis" post-surgery; plasmapheresis is often used pre-operatively to optimize respiratory status.

Q: What is the treatment of choice for Cushing's disease?

Transsphenoidal excision of the pituitary adenoma. **Explanation:** The treatment of choice for **Cushing’s disease** is **Transsphenoidal Surgery (TSS)**. **1. Why Option D is Correct:** Cushing’s **Disease** specifically refers to hypercortisolism caused by an ACTH-secreting pituitary adenoma. Since the primary pathology lies in the pituitary gland, the definitive treatment is the surgical removal of the adenoma via the transsphenoidal route. This approach offers high remission rates (70–90% for microadenomas) while preserving normal pituitary function. **2. Why Other Options are Incorrect:** * **A & B (Adrenalectomy):** These are not first-line for Cushing’s disease. Bilateral adrenalectomy is a "last resort" treatment used only when TSS and medical therapy fail. It carries the risk of **Nelson’s Syndrome** (rapid enlargement of the pituitary tumor due to loss of cortisol feedback). Open or laparoscopic adrenalectomy is the treatment of choice for adrenal-source Cushing’s (e.g., adenoma or carcinoma), not pituitary-source. * **C (Medical Management):** Drugs like Ketoconazole, Metyrapone, or Pasireotide are used as adjunctive therapy to control hypercortisolism pre-operatively or in patients who are not surgical candidates. They do not cure the underlying pituitary tumor. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of Cushing’s Syndrome:** Exogenous steroid use. * **Most common endogenous cause:** Cushing’s Disease (Pituitary adenoma ~70%). * **Screening tests:** 24-hour urinary free cortisol, Low-dose dexamethasone suppression test (LDDST), or late-night salivary cortisol. * **Localization:** High-dose dexamethasone suppression test (HDDST) suppresses cortisol in Cushing’s disease but **not** in adrenal tumors or ectopic ACTH production. * **Post-op monitoring:** Low serum cortisol levels (<2 µg/dL) shortly after TSS indicate a successful surgical outcome.

Q: Which of the following is the most preferred approach for pituitary surgery at the present time?

Transsphenoidal. **Explanation:** The **Transsphenoidal approach** is currently the gold standard and most preferred surgical route for the majority of pituitary tumors (e.g., adenomas, craniopharyngiomas). **Why Transsphenoidal is preferred:** This approach utilizes the natural corridor of the nasal cavity and sphenoid sinus to reach the sella turcica. Its primary advantages include: * **Minimal Invasiveness:** Avoids brain retraction and large craniotomies. * **Lower Morbidity:** Reduced risk of neurovascular injury and shorter recovery times. * **Endoscopic Advancement:** Modern pituitary surgery is predominantly **Endoscopic Endonasal Transsphenoidal Surgery**, providing superior visualization compared to the older microscopic method. **Analysis of Incorrect Options:** * **A. Transcranial:** Historically used for large tumors with massive lateral extension. It involves a craniotomy (e.g., subfrontal approach) and carries higher risks of brain edema and anosmia. It is now reserved for rare, complex cases. * **B. Transcallosal:** This route involves going through the corpus callosum. It is primarily used for lesions within the **third ventricle** or lateral ventricles, not for the sella turcica. * **C. Transethmoidal:** While this route reaches the midline, it provides a narrower field of view and is technically more cumbersome than the direct transsphenoidal route. **High-Yield Clinical Pearls for NEET-PG:** * **First-line treatment:** Surgery is the first-line treatment for all symptomatic pituitary adenomas **EXCEPT Prolactinomas** (which are treated medically with Dopamine agonists like Cabergoline). * **Complication:** The most common transient complication post-transsphenoidal surgery is **Diabetes Insipidus** (due to posterior pituitary manipulation). * **Contraindication:** A poorly pneumatized (conchal type) sphenoid sinus is a relative contraindication for the transsphenoidal approach.

Q: Which of the following describes a 'Scabbard Trachea'?

All of the above. ### Explanation **Scabbard Trachea** refers to a specific type of tracheal deformity where the airway becomes narrow and elongated in the anteroposterior diameter due to external pressure. **Why "All of the above" is correct:** * **Flattening of the trachea (Option A):** Chronic external pressure leads to the softening of the tracheal rings (tracheomalacia) and subsequent side-to-side narrowing. This results in a "flattened" appearance where the lateral walls are pushed inward, making the trachea look like a sword's sheath (scabbard). * **Lateral compression by swellings and tumors (Options B & C):** The most common cause is a **long-standing multinodular goiter** or a large thyroid malignancy. Any significant lateral mass, whether a benign swelling or a malignant tumor, that exerts persistent pressure on the flexible tracheal cartilages can result in this deformity. **Clinical Pearls for NEET-PG:** 1. **Most Common Cause:** Long-standing retrosternal or multinodular goiter. 2. **Radiological Finding:** On a chest X-ray or CT scan, the trachea appears narrowed in the coronal plane but elongated in the sagittal plane. 3. **Surgical Significance:** Patients with scabbard trachea are at high risk for **tracheal collapse** post-thyroidectomy. Once the supporting thyroid mass is removed, the weakened tracheal walls may collapse, leading to acute airway obstruction (requiring immediate intubation or tracheostomy). 4. **Diagnosis:** It is best evaluated using a CT scan of the neck and thorax to assess the degree of narrowing and the status of the cartilage.

Q: A patient presents with intermittent headache, hypertension, and a thyroid nodule. Which of the following steps should be taken next?

Urine VMA and aspiration of the thyroid nodule. ### Explanation **1. Why the correct answer is right:** The clinical presentation of **intermittent headache and hypertension** is classic for **Pheochromocytoma**. The presence of a **thyroid nodule** in this context strongly suggests **Multiple Endocrine Neoplasia Type 2 (MEN 2A or 2B)**, where Pheochromocytoma coexists with **Medullary Thyroid Carcinoma (MTC)**. In any patient suspected of having both, the **rule of priority** is to **exclude or manage the Pheochromocytoma first**. Performing a biopsy or surgery on a thyroid nodule in the presence of an undiagnosed pheochromocytoma can trigger a fatal hypertensive crisis due to catecholamine release. Therefore, the next steps are to confirm the pheochromocytoma via biochemical markers (**Urine VMA** or metanephrines) and evaluate the thyroid nodule via **Fine Needle Aspiration (FNA)**. **2. Why the incorrect options are wrong:** * **Option A (Urine HIAA):** 5-HIAA is a metabolite of serotonin used to diagnose **Carcinoid Syndrome**, which typically presents with flushing and diarrhea, not the paroxysmal hypertension seen here. * **Option C (Ultrasound Abdomen):** While an ultrasound or CT can localize an adrenal mass, **biochemical confirmation** (VMA/Metanephrines) must always precede imaging to avoid incidentaloma confusion. * **Option D (Echocardiography):** While useful to check for hypertensive cardiomyopathy, it is not a diagnostic step for the primary underlying pathology. **3. Clinical Pearls for NEET-PG:** * **MEN 2A:** MTC + Pheochromocytoma + Hyperparathyroidism. * **MEN 2B:** MTC + Pheochromocytoma + Mucosal Neuromas/Marfanoid habitus. * **Surgical Sequence:** Always operate on the Pheochromocytoma **before** the MTC or any other surgery. * **Screening:** In MTC patients, always screen for *RET* proto-oncogene mutations.

Question 1

Which of the following statements regarding follicular cell carcinoma of the thyroid is true?

Accepted Answer

Hematogenous spread

Answer

Commonly multifocal

Answer

Readily diagnosed by FNAC

Answer

Most common carcinoma of the thyroid

Question 2

What is the recommended treatment for papillary carcinoma of the thyroid with lymph node metastasis at level VI?

Accepted Answer

Total thyroidectomy plus central neck dissection

Answer

Total thyroidectomy

Answer

Total thyroidectomy plus radioiodine ablation

Answer

Total thyroidectomy plus radical neck dissection

Question 3

What is the treatment for a brown tumor?

Accepted Answer

Parathyroidectomy

Answer

Curettage

Answer

Surgical enucleation

Answer

Intralesional steroids

Question 4

All are true about the effect of thymectomy, EXCEPT:

Accepted Answer

Hypogammaglobulinemia usually responds to thymectomy.

Answer

Thymectomy results in the resolution of pure red cell aplasia in approximately 30% of patients.

Answer

Patients with myasthenia gravis have a thymoma in 10-15% of cases.

Answer

The course of myasthenia gravis is not significantly different in patients with or without thymoma.

Question 5

A patient undergoes thyroid surgery, following which he develops perioral tingling. Blood calcium is 8.9 meq/L. What is the next step?

Accepted Answer

Administer oral calcium.

Answer

Administer Vitamin D orally.

Answer

Administer intravenous calcium gluconate and perform serial monitoring.

Answer

Wait for calcium to decrease to <7.0 meq/L before taking further action.

Question 6

What is the treatment of choice for Cushing's disease?

Accepted Answer

Transsphenoidal excision of the pituitary adenoma

Answer

Open adrenalectomy

Answer

Bilateral adrenalectomy

Answer

Medical management

Question 7

All of the following are true about nodular goiter in females except?

Accepted Answer

Radioisotopic scanning is commonly employed withholding surgery.

Answer

Total thyroidectomy should be done in case of follicular lesion > 4 cm.

Answer

FNA should be done in any mass more than 1 cm.

Answer

Functional goiters are generally benign.

Question 8

Which of the following is the most preferred approach for pituitary surgery at the present time?

Accepted Answer

Transsphenoidal

Answer

Transcranial

Answer

Transcallosal

Answer

Transethmoidal

Question 9

Which of the following describes a 'Scabbard Trachea'?

Accepted Answer

All of the above

Answer

Flattening of the trachea

Answer

Caused by lateral compression by swellings

Answer

Caused by lateral compression by tumors

Question 10

A patient presents with intermittent headache, hypertension, and a thyroid nodule. Which of the following steps should be taken next?

Accepted Answer

Urine VMA and aspiration of the thyroid nodule

Answer

Urine HIAA levels

Answer

Ultrasound abdomen

Answer

Echocardiography

Endocrine Surgery — MCQs

Endocrine Surgery — MCQs

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