Endocrine Surgery Practice Questions

Q: What is the most common cause of respiratory distress after thyroidectomy?

Laryngeal edema. **Explanation:** Respiratory distress following thyroidectomy is a critical surgical emergency. While multiple factors can contribute, **laryngeal edema** is statistically the **most common cause** of post-operative airway obstruction. **1. Why Laryngeal Edema is Correct:** Laryngeal edema typically results from trauma during endotracheal intubation, surgical manipulation of the trachea, or venous/lymphatic congestion following the removal of a large goiter. It leads to narrowing of the glottic aperture, causing inspiratory stridor and respiratory distress, usually manifesting within the first few hours post-surgery. **2. Analysis of Incorrect Options:** * **Bilateral Recurrent Laryngeal Nerve (RLN) Palsy:** This is the **most serious** cause of immediate airway obstruction (due to the vocal cords remaining in the paramedian position), but it is rare compared to edema. * **Cervical Hematoma:** This is the most common cause of **tension-related** airway distress. It causes venous congestion and secondary laryngeal edema rather than direct tracheal compression. It is a surgical emergency requiring immediate bedside evacuation. * **Hypoparathyroidism:** (Note: Option D says Hyperparathyroidism, which is incorrect). Hypocalcemia resulting from hypoparathyroidism can cause **laryngospasm** (Tetany), but this typically occurs 24–72 hours post-operatively, not immediately. **Clinical Pearls for NEET-PG:** * **Most common cause overall:** Laryngeal edema. * **Most common cause of "Tension" distress:** Reactionary hemorrhage (Hematoma). * **Management of Hematoma:** Immediate opening of the wound at the bedside (do not wait for the OR). * **Tracheomalacia:** Consider this if the patient has had a long-standing, large goiter causing pressure atrophy of tracheal rings. * **Unilateral RLN injury:** Presents as hoarseness, not respiratory distress.

Q: What is the prognosis associated with Multiple Endocrine Neoplasia type 2 (MEN 2) syndromes?

Bad prognosis. **Explanation:** The prognosis of **Multiple Endocrine Neoplasia type 2 (MEN 2)** is generally considered **bad** (poor) primarily due to the aggressive nature of **Medullary Thyroid Carcinoma (MTC)**, which is present in nearly 100% of affected individuals. Unlike the more common papillary thyroid cancers, MTC does not respond to radioactive iodine or hormone suppression, and it tends to metastasize early to cervical and mediastinal lymph nodes. Within the MEN 2 spectrum, **MEN 2B** carries the worst prognosis because MTC develops in early childhood and is highly virulent. **Analysis of Options:** * **A. Good prognosis:** Incorrect. The high mortality rate associated with early-onset MTC and the potential for hypertensive crises from associated Pheochromocytomas make the overall prognosis poor compared to MEN 1. * **C. Late presentation:** Incorrect. MEN 2 syndromes often present **early** (especially MEN 2B in infancy/childhood). Current clinical guidelines mandate early screening and prophylactic thyroidectomy based on genetic testing. * **D. Chromosome 11 mutation:** Incorrect. MEN 2 is caused by a mutation in the **RET proto-oncogene on Chromosome 10**. Chromosome 11 (MEN1 gene) is associated with MEN type 1 (Wermer’s Syndrome). **High-Yield Clinical Pearls for NEET-PG:** * **Genetic Basis:** MEN 2 is autosomal dominant; caused by a gain-of-function mutation in the **RET proto-oncogene**. * **MEN 2A (Sipple Syndrome):** MTC + Pheochromocytoma + Parathyroid Hyperplasia. * **MEN 2B (Wagenmann-Froboese):** MTC + Pheochromocytoma + Mucosal Neuromas + Marfanoid habitus (No parathyroid involvement). * **Management:** Prophylactic thyroidectomy is the treatment of choice, often performed before age 5 (MEN 2A) or even in infancy (MEN 2B). Always exclude/treat Pheochromocytoma before any surgery to prevent intraoperative hypertensive crisis.

Q: Minimally invasive video-assisted thyroidectomy can be performed in all of the following conditions EXCEPT:

Prior neck surgery. **Explanation:** Minimally Invasive Video-Assisted Thyroidectomy (MIVAT), popularized by Miccoli, is a technique used to perform thyroid surgery through a small incision (usually 1.5–2 cm) with the aid of an endoscope. **Why "Prior neck surgery" is the correct answer:** Prior neck surgery or neck irradiation is a **strict contraindication** for MIVAT. Previous surgery leads to the formation of dense adhesions and loss of normal anatomical planes. This increases the risk of injury to the recurrent laryngeal nerve and parathyroid glands, making the limited visualization and restricted maneuverability of the video-assisted approach unsafe. **Analysis of Incorrect Options:** * **Benign solitary nodule:** This is the most common indication for MIVAT. As long as the nodule size is within limits (typically <30–35 mm), it is easily managed. * **Thyroid volume <25mL:** Small thyroid volume is a primary selection criterion. Large glands cannot be safely delivered through the small MIVAT incision. * **Follicular neoplasm:** Low-risk malignancies and follicular neoplasms (where the diagnosis of malignancy is uncertain pre-operatively) are suitable for MIVAT, provided the nodule size is small. **NEET-PG High-Yield Pearls:** * **Incision size:** 1.5 to 2 cm (compared to 6-8 cm in conventional surgery). * **Inclusion Criteria:** Nodule diameter ≤ 35 mm, total thyroid volume < 20-25 mL, and no evidence of thyroiditis or lymphadenopathy. * **Contraindications:** Large goiters, previous neck surgery/radiation, locally invasive malignancy, and Hashimoto’s thyroiditis (due to increased vascularity and friability). * **Advantage:** Better cosmetic outcome and reduced postoperative pain.

Q: All of the following are true about insulinoma EXCEPT:

It is usually asymptomatic and requires no treatment.. **Explanation:** Insulinoma is the most common functional neuroendocrine tumor (NET) of the pancreas. The correct answer is **Option A** because insulinomas are **never asymptomatic**; they characteristically present with **Whipple’s Triad**: symptoms of hypoglycemia (confusion, sweating, palpitations), documented low blood glucose (<50 mg/dL), and immediate relief of symptoms upon glucose administration. Treatment is mandatory, usually via surgical resection (enucleation), as the hypoglycemia can be life-threatening. **Analysis of other options:** * **Option B:** While 90% of insulinomas are solitary and benign, they are typically **small** (<2 cm). In the context of MEN-1 syndrome, they are frequently **multiple**, making this a characteristic feature to consider during surgical mapping. * **Option C:** Medical management is used for preoperative stabilization or in inoperable cases. **Diazoxide** inhibits insulin release from beta cells, and **Octreotide** (a somatostatin analogue) suppresses insulin secretion by binding to SSTR receptors. * **Option D:** The **pancreas** is the primary site; insulinomas are distributed equally across the head, body, and tail of the pancreas. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 90s:** 90% are solitary, 90% are benign, 90% are <2 cm, and 90% are intrapancreatic. * **Diagnosis:** The gold standard is the **72-hour supervised fast** (showing elevated insulin and C-peptide levels despite hypoglycemia). * **Localization:** Intraoperative ultrasound (IOUS) is the most sensitive method for localization during surgery. * **Association:** If multiple, suspect **MEN-1 syndrome**.

Q: All of the following regarding papillary carcinoma of the thyroid is true EXCEPT:

Bony metastasis in early stage. **Explanation:** Papillary Thyroid Carcinoma (PTC) is the most common thyroid malignancy (80-85%). The correct answer is **D** because PTC is characterized by **lymphatic spread** rather than hematogenous spread. Bony metastases are rare and typically occur only in very advanced stages or in the follicular variant. **Why Option D is the correct answer (False statement):** Early bony metastasis is a hallmark of **Follicular Thyroid Carcinoma (FTC)**, which spreads via the bloodstream (hematogenous). In contrast, PTC spreads primarily via lymphatics to the cervical lymph nodes. **Why other options are incorrect (True statements):** * **A. Multicentric origin:** PTC is frequently multifocal (up to 60-80% of cases), involving both lobes due to intraglandular lymphatic spread. * **B. Secondaries to lymph nodes:** This is the most common mode of spread. Approximately 50% of patients have cervical lymph node involvement at the time of diagnosis. * **C. Slow growing:** PTC is an indolent tumor with an excellent prognosis; the 10-year survival rate often exceeds 90%. **NEET-PG High-Yield Pearls:** * **Pathology:** Look for **Psammoma bodies** (calcified laminations) and **Orphan Annie eye nuclei** (clear nuclei with central clearing). * **Risk Factor:** Prior exposure to **ionizing radiation** is the most significant risk factor. * **Diagnosis:** FNAC is the investigation of choice (cannot distinguish between Follicular Adenoma and Carcinoma, but is definitive for Papillary). * **Prognosis:** Excellent, often staged using the **AMES** or **MACIS** criteria.

Q: A 42-year-old woman presents with a diffuse swelling in front of her neck. Thyroid function tests are within normal limits. A fine-needle biopsy reveals malignant cells. On examination of the excised tumor, the tumor cells are positive for calcitonin on immunohistochemistry. What is the appropriate pathologic diagnosis?

Medullary carcinoma. ### Explanation **Correct Answer: C. Medullary Carcinoma** The definitive diagnostic clue in this case is the **immunohistochemical (IHC) positivity for calcitonin**. Medullary Thyroid Carcinoma (MTC) originates from the **Parafollicular C-cells** (derived from the neural crest), which are responsible for secreting calcitonin. Unlike other thyroid cancers, MTC is not derived from follicular cells; therefore, patients are typically euthyroid (normal T3, T4, TSH). **Why other options are incorrect:** * **Papillary Carcinoma (D):** The most common thyroid malignancy. It is characterized by nuclear features (Orphan Annie eyes, Psammoma bodies) and is IHC positive for **Thyroglobulin**, not calcitonin. * **Follicular Carcinoma (B):** Derived from follicular cells and spreads hematogenously. Like papillary carcinoma, it is IHC positive for **Thyroglobulin**. * **Anaplastic Carcinoma (A):** A highly aggressive, undifferentiated tumor usually seen in the elderly. It typically presents as a rapidly enlarging mass with compressive symptoms and lacks specific markers like calcitonin. **High-Yield Clinical Pearls for NEET-PG:** * **Biomarkers:** Calcitonin is used for both diagnosis and monitoring recurrence. Carcinoembryonic Antigen (CEA) is also often elevated. * **Genetics:** Approximately 25% of MTC cases are familial (associated with **MEN 2A and 2B** syndromes) due to **RET proto-oncogene** mutations. 75% are sporadic. * **Pathology:** Characterized by deposits of **Amyloid** (formed by pro-calcitonin) which stains with **Congo Red** (showing apple-green birefringence). * **Surgery:** The treatment of choice is **Total Thyroidectomy with Central Compartment Neck Dissection**, as MTC does not concentrate radioiodine (I-131).

Question 1

What is the most common cause of respiratory distress after thyroidectomy?

Accepted Answer

Laryngeal edema

Answer

Bilateral recurrent laryngeal nerve palsy

Answer

Cervical hematoma

Answer

Hyperparathyroidism

Question 2

What is the prognosis associated with Multiple Endocrine Neoplasia type 2 (MEN 2) syndromes?

Accepted Answer

Bad prognosis

Answer

Good prognosis

Answer

Late presentation

Answer

Chromosome 11 mutation

Question 3

Minimally invasive video-assisted thyroidectomy can be performed in all of the following conditions EXCEPT:

Accepted Answer

Prior neck surgery

Answer

Benign solitary nodule

Answer

Thyroid volume <25mL

Answer

Follicular neoplasm

Question 4

All of the following are true about insulinoma EXCEPT:

Accepted Answer

It is usually asymptomatic and requires no treatment.

Answer

It is usually small and multiple.

Answer

Diazoxide and octreotide reduce insulin synthesis.

Answer

The most common site is the pancreas.

Question 5

Which nerve is most likely to be involved in malignant spread and thyroid surgery?

Accepted Answer

Both recurrent laryngeal nerve and superior laryngeal nerve

Answer

Recurrent laryngeal nerve

Answer

Superior laryngeal nerve

Answer

Internal laryngeal nerve

Question 6

All of the following regarding papillary carcinoma of the thyroid is true EXCEPT:

Accepted Answer

Bony metastasis in early stage

Answer

Multicentric origin

Answer

Secondaries to lymph nodes

Answer

Slow growing

Question 7

A patient is diagnosed with a prolactinoma encircling the carotid artery. What is the best line of management?

Accepted Answer

Transsphenoidal surgical resection

Answer

Wait and watch

Answer

Radiotherapy

Answer

Combination therapy

Question 8

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

Accepted Answer

Most cases are sporadic.

Answer

It is a tumor arising from C cells derived from the neural crest.

Answer

It secretes high levels of calcitonin.

Answer

It is not dependent on TSH.

Question 9

A female with a history of recurrent renal stones presented with severe bone pain. Laboratory findings are indicative of primary hyperparathyroidism secondary to parathyroid hyperplasia. What is the recommended treatment?

Accepted Answer

Removal of all parathyroid glands leaving a 50 mg tissue remnant

Answer

Removal of all four parathyroid glands

Answer

Calcitonin

Answer

Enlargement of parathyroid glands

Question 10

A 42-year-old woman presents with a diffuse swelling in front of her neck. Thyroid function tests are within normal limits. A fine-needle biopsy reveals malignant cells. On examination of the excised tumor, the tumor cells are positive for calcitonin on immunohistochemistry. What is the appropriate pathologic diagnosis?

Accepted Answer

Medullary carcinoma

Answer

Anaplastic carcinoma

Answer

Follicular carcinoma

Answer

Papillary carcinoma

Endocrine Surgery — MCQs

Endocrine Surgery — MCQs

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