Endocrine Surgery Practice Questions

Q: Chvostek sign could be seen after -

Total Thyroidectomy. ***Total Thyroidectomy*** - A total thyroidectomy involves the removal of the entire thyroid gland, which can inadvertently lead to the removal or damage of the **parathyroid glands** as well. - Damage to the parathyroid glands causes **hypoparathyroidism**, leading to **hypocalcemia**, which is characterized by neuromuscular excitability manifesting as a **Chvostek sign**. *Subtotal Thyroidectomy* - In a subtotal thyroidectomy, only a portion of the thyroid gland is removed, leaving some functional parathyroid tissue intact. - This procedure usually preserves enough parathyroid function to prevent severe **hypocalcemia** and the manifestation of a Chvostek sign. *Heller's Cardiomyotomy* - Heller's cardiomyotomy is a surgical procedure performed to treat **achalasia**, involving the cutting of muscle fibers in the esophagus. - This procedure does not involve the neck region or the parathyroid glands and therefore has no direct association with calcium regulation or the **Chvostek sign**. *Gastrojejunostomy* - A gastrojejunostomy is a surgical procedure that creates a bypass between the stomach and the jejunum, typically performed for conditions like gastric outlet obstruction or as part of bariatric surgery. - This operation is limited to the abdominal cavity and has no direct impact on calcium metabolism or the parathyroid glands that would elicit a **Chvostek sign**.

Q: What is the treatment of choice for medullary carcinoma of the thyroid?

Total thyroidectomy. ***Total thyroidectomy*** - This is the **treatment of choice for medullary thyroid carcinoma (MTC)** due to its multifocal nature and high propensity for lymph node metastasis - **Complete surgical resection** (often with central compartment neck dissection) provides the best chance for cure by removing all thyroid tissue and involved lymph nodes - MTC arises from **parafollicular C cells** (calcitonin-producing cells) and frequently involves both lobes, making total thyroidectomy essential *Partial thyroidectomy* - This procedure removes only a portion of the thyroid gland, which is **insufficient for MTC** given its tendency for multifocality and bilateral involvement - Leaves residual thyroid tissue that could harbor undetected disease or develop future recurrences - Does not adequately address the aggressive nature of MTC *I-131 ablation* - **Radioactive iodine therapy** is effective for differentiated thyroid cancers (papillary and follicular) that take up iodine - MTC originates from **parafollicular C cells that do not concentrate iodine**, making I-131 ablation completely ineffective - This is a key distinguishing feature of MTC from other thyroid malignancies *Hemithyroidectomy* - This procedure removes only one thyroid lobe, which is **inadequate for MTC** - Risks leaving behind primary tumor in the contralateral lobe or occult bilateral disease - Fails to address the multifocal nature of MTC, particularly in hereditary cases (MEN 2A, MEN 2B, familial MTC)

Q: What is the investigation of choice for detecting recurrence after parathyroid gland surgery?

Sestamibi scan. ***Sestamibi scan*** - A **sestamibi scan** is the investigation of choice for **localizing recurrent or persistent hyperparathyroidism** because **parathyroid tissue preferentially retains the tracer** longer than thyroid tissue. - This nuclear medicine imaging technique helps identify ectopic or very small parathyroid adenomas, which may be difficult to locate with other methods. *SPECT* - **Single-photon emission computed tomography (SPECT)** can be used as an adjunct to a sestamibi scan (SPECT-Sestamibi) to provide 3D images and improve localization, but it is typically not the initial or standalone investigation of choice for recurrence. - While SPECT offers increased sensitivity and specificity over planar imaging by removing superimposed structures, the **sestamibi uptake itself is the crucial diagnostic marker**. *MRI* - **Magnetic resonance imaging (MRI)** is generally used for detailed anatomical assessment of the neck and mediastinum, especially if there's concern for **ectopic glands or complex anatomy**. - However, it is less sensitive than sestamibi for detecting small or recurrent hyperactive parathyroid tissue due to its reliance on anatomical rather than functional abnormalities. *Neck ultrasound* - **Neck ultrasound** is an excellent initial imaging modality for primary hyperparathyroidism due to its **affordability and ability to visualize cervical parathyroid glands**. - For detecting recurrence, its utility is limited, especially in cases of **ectopic glands** (e.g., in the mediastinum) or if scar tissue hinders clear visualization.

Q: A case of solitary thyroid nodule; the investigation of choice is:

FNAC. ***Correct: FNAC*** - **Fine needle aspiration cytology (FNAC)** is the most important and definitive diagnostic tool for evaluating the malignancy risk of a **solitary thyroid nodule**. - It's a minimally invasive, cost-effective procedure with high sensitivity and specificity in differentiating **benign** from **malignant** lesions. - FNAC is recommended as the **first-line investigation** by major thyroid guidelines (ATA, BTA). *Incorrect: T3, T4 estimation* - **Thyroid hormone levels (T3, T4)** primarily assess thyroid function (hyperthyroidism or hypothyroidism), not the **malignancy potential** of a nodule itself. - While thyroid dysfunction can sometimes be associated with nodules, these tests alone cannot definitively diagnose or rule out cancer. - Thyroid function tests are complementary but not the primary investigation for nodule characterization. *Incorrect: Thyroid scan* - A **thyroid scan** (using radioactive iodine) helps determine if a nodule is "hot" (hyperfunctioning/benign) or "cold" (non-functioning/potentially malignant). - However, it cannot definitively differentiate between benign and malignant **cold nodules**, which require further investigation, typically FNAC. - Thyroid scanning has largely been superseded by ultrasound and FNAC in modern practice. *Incorrect: Excision biopsy* - **Excision biopsy** (surgical removal) is a treatment for a thyroid nodule rather than the initial investigation of choice. - It is typically performed when **FNAC results are indeterminate** or suspicious for malignancy, or when the nodule is significantly large or symptomatic. - This is an invasive procedure with surgical risks and is not appropriate as a first-line investigation.

Q: Following total thyroidectomy, the patient develops respiratory stridor. The cause is:

Bilateral recurrent laryngeal nerve paralysis. ***Bilateral recurrent laryngeal nerve paralysis*** - **Bilateral recurrent laryngeal nerve paralysis** is a serious complication of total thyroidectomy, leading to **adductor paralysis** of both vocal cords. - This results in a narrowed airway, causing inspiratory **stridor**, **dyspnea**, and potentially acute respiratory obstruction requiring reintubation or tracheostomy. *Unilateral recurrent laryngeal nerve paralysis* - **Unilateral recurrent laryngeal nerve paralysis** typically causes **hoarseness** due to the inability of one vocal cord to adduct properly. - It does not usually cause **stridor** or significant respiratory distress because the other vocal cord can still compensate for airway patency. *Unilateral phrenic nerve paralysis* - **Unilateral phrenic nerve paralysis** affects one side of the **diaphragm**, causing **dyspnea** and reduced lung capacity, particularly during exertion. - It does not directly cause **stridor**, which is a sound produced by turbulent airflow through a narrowed upper airway. *Bilateral phrenic nerve paralysis* - **Bilateral phrenic nerve paralysis** causes severe **respiratory failure** due to complete paralysis of the **diaphragm**, requiring mechanical ventilation. - While life-threatening, it does not directly manifest as **stridor**, as the primary issue is the inability to move air in and out through the lower respiratory system, not an obstruction in the upper airway.

Q: A patient develops recurrent hyperparathyroidism 2 years after initial parathyroidectomy and has experienced cardiovascular complications due to persistent hypercalcemia. What is the most appropriate management?

Repeat parathyroidectomy after medical optimization. ***Repeat parathyroidectomy after medical optimization*** - Recurrent **hyperparathyroidism** often requires repeat surgery, particularly in patients who have experienced cardiovascular events, as persistent hypercalcemia can exacerbate cardiac risk. - **Medical optimization** of cardiovascular conditions and metabolic status before reoperation is crucial to minimize surgical risks and improve outcomes. *Repeat neck surgery* - While repeat neck surgery is often necessary, this option is incomplete as it does not sufficiently emphasize the importance of **medical optimization** in patients with a history of cardiovascular events. - Performing surgery without adequate pre-operative evaluation and optimization can lead to increased **perioperative complications** in this high-risk group. *Observation and repeat serum Ca2+ in two months* - **Observation** is generally not appropriate for recurrent hyperparathyroidism, especially when it has already led to cardiovascular events, as continued hypercalcemia poses significant long-term health risks. - Delaying definitive treatment allows for ongoing end-organ damage, including worsening **cardiovascular disease** and bone complications. *Medical management with calcimimetics (cinacalcet)* - **Calcimimetics** like **cinacalcet** can reduce parathyroid hormone (PTH) and calcium levels, but they are typically used as an adjunct or for patients who are not surgical candidates. - In cases of recurrent hyperparathyroidism, especially with clinical sequelae like cardiovascular events, **surgical removal of the adenoma** remains the definitive treatment to achieve a cure.

Q: A 23-year-old woman undergoes total thyroidectomy for carcinoma of the thyroid gland. On the second postoperative day, she begins to complain of a tingling sensation in her hands and appears anxious, later complaining of muscle cramps. Which of the following is the most appropriate initial management strategy?

Continuous infusion of calcium gluconate. ***Continuous infusion of calcium gluconate*** - The patient's symptoms of **tingling sensation in hands**, **anxiety**, and **muscle cramps** after a total thyroidectomy are highly suggestive of **hypocalcemia**, likely due to iatrogenic hypoparathyroidism. - An initial bolus followed by a **continuous infusion of calcium gluconate** is the most appropriate management for symptomatic hypocalcemia to rapidly replete calcium levels and prevent further complications. *10 mL of 10% magnesium sulfate intravenously* - While **hypomagnesemia** can sometimes cause refractory hypocalcemia, it is not the primary electrolyte abnormality indicated by these specific symptoms following thyroidectomy. - Administering magnesium sulfate as the initial and sole treatment would fail to address the underlying **calcium deficiency** directly and might delay appropriate management. *Oral vitamin D* - **Oral vitamin D** is used for chronic management of hypocalcemia, as it helps improve calcium absorption. - However, it has a slow onset of action and is not suitable for the **acute and symptomatic hypocalcemia** that requires immediate intervention. *100 mg oral Synthroid* - **Synthroid (levothyroxine)** is thyroid hormone replacement therapy, indicated for hypothyroidism following thyroidectomy. - While necessary for long-term management, it does not address the **acute symptoms of hypocalcemia** and would be inappropriate as an initial treatment for this emergent condition.

Q: A post-thyroidectomy patient develops signs and symptoms of tetany. The management is:

IV calcium gluconate. ***IV calcium gluconate*** - **Tetany** after thyroidectomy is most commonly due to **hypocalcemia** from inadvertent **parathyroid gland removal** or damage, leading to decreased PTH production. - **Intravenous calcium gluconate** is the first-line treatment for acute, symptomatic hypocalcemia and tetany due to its rapid action in reversing neuromuscular excitability. *Bicarbonate* - Bicarbonate is used to treat **acidosis** and does not directly address hypocalcemia. - In fact, alkaline solutions like bicarbonate can **worsen hypocalcemia** by increasing protein binding of calcium, thus reducing ionized calcium levels. *Calcitonin* - **Calcitonin** is a hormone that **lowers serum calcium** by inhibiting osteoclast activity and increasing renal calcium excretion. - It would be contraindicated in a patient with hypocalcemic tetany as it would further decrease calcium levels. *Vitamin D* - **Vitamin D** (e.g., calcitriol) is essential for **long-term calcium absorption** and maintaining calcium homeostasis in chronic hypocalcemia. - However, its onset of action is too slow to treat acute, symptomatic tetany, which requires immediate calcium repletion.

Q: Which of the following changes in voice is not produced as a result of external laryngeal nerve injury post thyroidectomy?

Hoarseness. ***Hoarseness*** - **Hoarseness** is primarily caused by injury to the **recurrent laryngeal nerve (RLN)**, which innervates most intrinsic laryngeal muscles responsible for vocal cord adduction and abduction. - An external laryngeal nerve (ELN) injury affects the **cricothyroid muscle**, leading to less tension on the vocal cords, but typically not frank hoarseness. *Voice fatigue* - Injury to the external laryngeal nerve (ELN) weakens the **cricothyroid muscle**, which is responsible for tensing and elongating the vocal cords. - This weakness leads to greater effort required to maintain vocal quality, resulting in **voice fatigue**. *Inability to sing at higher ranges* - The **cricothyroid muscle**, innervated by the ELN, is crucial for increasing vocal cord tension. - Increased tension is necessary for adjusting vocal pitch and reaching **higher frequencies** or notes. *Poor volume and projection* - The cricothyroid muscle's role in vocal cord tension contributes to the efficiency of vocal fold vibration. - Reduced tension due to ELN injury can lead to decreased **vocal power and projection**.

Q: Which metastases are most common to the thyroid?

Kidney. ***Kidney (Renal Cell Carcinoma)*** - **Renal cell carcinoma** is the most common primary tumor to metastasize to the thyroid gland, accounting for approximately 30-50% of all thyroid metastases. - Thyroid metastases from renal cancer are often **hypervascular** and may present as rapidly growing thyroid nodules. - These metastases typically indicate advanced disease and occur in the setting of widespread metastatic involvement. *Lung* - **Lung cancer** is the second most common source of thyroid metastases, particularly small cell and non-small cell carcinoma. - Lung cancer metastases to the thyroid usually occur in patients with known disseminated disease. - These are often identified incidentally during imaging or at autopsy. *Breast* - **Breast cancer** is the third most common primary tumor to metastasize to the thyroid. - Lobular carcinoma of the breast shows a higher propensity for thyroid metastases compared to ductal carcinoma. - Presentation is typically in the context of widespread metastatic disease. *GIT* - **Gastrointestinal (GIT) cancers**, including colorectal and gastric cancers, are uncommon sources of thyroid metastases. - When present, GIT metastases to the thyroid signify advanced disease with multiple organ involvement. - These are rare and usually discovered incidentally during evaluation for other metastatic sites.

Question 1

Chvostek sign could be seen after -

Accepted Answer

Total Thyroidectomy

Answer

Subtotal Thyroidectomy

Answer

Heller's Cardiomyotomy

Answer

Gastrojejunostomy

Question 2

What is the treatment of choice for medullary carcinoma of the thyroid?

Accepted Answer

Total thyroidectomy

Answer

I-131 ablation

Answer

Partial thyroidectomy

Answer

Hemithyroidectomy

Question 3

What is the investigation of choice for detecting recurrence after parathyroid gland surgery?

Accepted Answer

Sestamibi scan

Answer

SPECT

Answer

MRI

Answer

Neck ultrasound

Question 4

A case of solitary thyroid nodule; the investigation of choice is:

Accepted Answer

FNAC

Answer

T3, T4 estimation

Answer

Thyroid scan

Answer

Excision biopsy

Question 5

Following total thyroidectomy, the patient develops respiratory stridor. The cause is:

Accepted Answer

Bilateral recurrent laryngeal nerve paralysis

Answer

Unilateral recurrent laryngeal nerve paralysis

Answer

Unilateral phrenic nerve paralysis

Answer

Bilateral phrenic nerve paralysis

Question 6

A patient develops recurrent hyperparathyroidism 2 years after initial parathyroidectomy and has experienced cardiovascular complications due to persistent hypercalcemia. What is the most appropriate management?

Accepted Answer

Repeat parathyroidectomy after medical optimization

Answer

Repeat neck surgery

Answer

Observation and repeat serum Ca2+ in two months

Answer

Medical management with calcimimetics (cinacalcet)

Question 7

A 23-year-old woman undergoes total thyroidectomy for carcinoma of the thyroid gland. On the second postoperative day, she begins to complain of a tingling sensation in her hands and appears anxious, later complaining of muscle cramps. Which of the following is the most appropriate initial management strategy?

Accepted Answer

Continuous infusion of calcium gluconate

Answer

10 mL of 10% magnesium sulfate intravenously

Answer

Oral vitamin D

Answer

100 mg oral Synthroid

Question 8

A post-thyroidectomy patient develops signs and symptoms of tetany. The management is:

Accepted Answer

IV calcium gluconate

Answer

Bicarbonate

Answer

Calcitonin

Answer

Vitamin D

Question 9

Which of the following changes in voice is not produced as a result of external laryngeal nerve injury post thyroidectomy?

Accepted Answer

Hoarseness

Answer

Inability to sing at higher ranges

Answer

Poor volume and projection

Answer

Voice fatigue

Question 10

Which metastases are most common to the thyroid?

Accepted Answer

Kidney

Answer

GIT

Answer

Lung

Answer

Breast

Endocrine Surgery — MCQs

Endocrine Surgery — MCQs

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