Endocrine Surgery Practice Questions

Q: What surgical procedure is indicated for a patient with symptomatic pheochromocytoma?

Adrenalectomy. ***Adrenalectomy*** - A **pheochromocytoma** is a catecholamine-secreting tumor typically arising from the **adrenal medulla**, making surgical removal of the affected adrenal gland the definitive treatment. - Prior to surgery, patients require rigorous **alpha-blockade** to control blood pressure and prevent a hypertensive crisis during tumor manipulation. *Pancreatectomy* - This procedure involves the surgical removal of part or all of the **pancreas**. - It is indicated for conditions such as **pancreatic cancer**, severe pancreatitis, or neuroendocrine tumors of the pancreas, not for adrenal tumors. *Thyroidectomy* - **Thyroidectomy** is the surgical removal of all or part of the thyroid gland. - This procedure is performed for conditions like **thyroid cancer**, goiter, or hyperthyroidism that is unresponsive to medical management. *Parathyroidectomy* - This surgical procedure involves the removal of one or more **parathyroid glands**. - It is primarily indicated for the treatment of **hyperparathyroidism**, a condition characterized by excessive parathyroid hormone production.

Q: A patient undergoing a thyroidectomy is at risk of hypocalcemia post-operation due to the accidental removal of which glands?

Parathyroid glands. ***Parathyroid glands*** - The **parathyroid glands** are small glands located on or near the thyroid gland and are responsible for regulating **calcium levels** in the blood by secreting **parathyroid hormone (PTH)**. - Accidental removal or damage to these glands during a thyroidectomy can lead to decreased PTH production, resulting in **hypocalcemia**. *Pituitary glands* - The **pituitary gland** is located at the base of the brain and controls many other endocrine glands, but it is **not involved** in calcium regulation directly or located near the thyroid. - Damage to the pituitary would impact hormones such as TSH, growth hormone, and cortisol, not primarily calcium levels. *Thyroid glands* - The **thyroid gland** itself is the target of the surgery; its removal causes **hypothyroidism**, not hypocalcemia, although it does produce **calcitonin**, which slightly lowers calcium but is not the primary regulator. - Calcitonin's role in calcium homeostasis is relatively minor compared to PTH, so thyroid removal alone does not cause significant hypocalcemia. *Adrenal glands* - The **adrenal glands** are located on top of the kidneys and produce hormones like **cortisol** and **aldosterone**, which regulate stress response, metabolism, and blood pressure. - They have **no direct role** in regulating calcium levels and are anatomically distant from the thyroid.

Q: What is the most appropriate treatment for a malignant thyroid nodule with lymphadenopathy?

Total thyroidectomy with modified radical neck dissection. ***Total thyroidectomy with modified radical neck dissection*** - This approach is indicated for **malignant thyroid nodules** with **lymph node involvement** (lymphadenopathy) to ensure complete removal of visible and microscopic disease. It includes removal of the thyroid gland, along with affected lymph nodes and surrounding soft tissue in the neck. - Patients typically receive **radioactive iodine (RAI) therapy** post-operatively to ablate any remaining microscopic thyroid tissue or metastatic disease. *Radiation therapy* - **External beam radiation therapy** is generally reserved for **anaplastic thyroid cancer** or as palliative treatment for locally advanced, unresectable disease or bony metastases. - It is not considered first-line curative treatment for differentiated thyroid cancers with lymphadenopathy. *Surgical excision of the nodule* - **Simple nodule excision** (lumpectomy or lobectomy) would be insufficient in the presence of **lymphadenopathy**, as it would leave behind metastatic disease in the lymph nodes. - This approach is typically reserved for **benign nodules** or very small, low-risk papillary microcarcinomas without evidence of spread. *Chemotherapy* - **Chemotherapy** plays a limited role in the treatment of most differentiated thyroid cancers and is primarily used for **anaplastic thyroid cancer** or in cases of widespread **metastatic disease** unresponsive to other treatments. - It is not a primary treatment for localized malignant thyroid nodules with regional lymph node metastasis.

Q: What is the initial investigation of choice for a thyroid nodule with increased radioisotope uptake?

Clinical observation. ***Correct: Clinical observation*** - A thyroid nodule with **increased radioisotope uptake** ("hot" nodule) is **almost always benign**, with malignancy risk <5%. - Hot nodules typically represent **autonomous thyroid tissue** and are usually associated with normal or suppressed TSH. - The initial approach after identifying a hot nodule is **clinical observation with thyroid function assessment**, as these nodules rarely require invasive investigation. - If the patient is **euthyroid** (normal thyroid function), watchful waiting with periodic clinical evaluation is appropriate. *Incorrect: Repeat thyroid scan in 6-12 months* - While follow-up imaging may be appropriate later, this represents **follow-up** rather than the **initial investigation**. - After identifying increased uptake on isotope scan, the next step is typically **thyroid function tests**, not another scan. - Repeat scanning in 6-12 months would be considered part of ongoing monitoring, not the immediate next investigative step. *Incorrect: Treatment of hyperthyroidism* - This is a **therapeutic intervention**, not an **investigation**. - Treatment would only be initiated if the patient has **documented hyperthyroidism** with suppressed TSH and elevated thyroid hormones. - Assessment of thyroid function status must precede any treatment decision. *Incorrect: FNAC* - **Fine-needle aspiration cytology (FNAC)** is indicated for **"cold" nodules** (decreased or absent radioisotope uptake) due to their higher malignancy risk (5-15%). - Hot nodules have such a **low malignancy risk** that FNAC is **not recommended** as routine investigation. - FNAC would be invasive and unnecessary given the benign nature of hot nodules.

Q: Parathyroid autoimplantation takes place in which muscle?

Brachioradialis. ***Brachioradialis*** - The **brachioradialis muscle** in the forearm is the preferred site for parathyroid autoimplantation due to its accessibility and favorable blood supply. - This muscle allows for easy **monitoring of parathyroid graft function** and re-exploration if necessary. *Sternocleidomastoid* - While located in the neck, the **sternocleidomastoid muscle** is generally not used for parathyroid autoimplantation due to potential cosmetic concerns and the risk of damage to vital neck structures. - Its proximity to the original parathyroid glands could make it difficult to differentiate native tissue from implanted grafts if future surgery is required. *Triceps* - The **triceps muscle** in the upper arm is a large muscle, but it is not typically chosen for parathyroid autoimplantation. - It is less accessible for routine examination and potential re-exploration compared to the brachial region. *Sartorius* - The **sartorius muscle** is located in the thigh and is not used for parathyroid autoimplantation. - Its distant location from the head and neck region would make monitoring and re-exploration of the graft impractical.

Q: In a patient with parathyroid adenoma, how do we confirm the removal of the correct gland after surgery?

50% reduction in PTH after 10 minutes. ***50% reduction in PTH after 10 minutes*** - Intraoperative **PTH monitoring** is crucial for confirming complete removal of hyperfunctioning parathyroid tissue during parathyroidectomy. - A successful surgery is indicated by a **≥50% drop** in PTH levels from the baseline (pre-excision) or highest post-excision level within **10 minutes** of gland removal. *25% reduction in PTH after 10 minutes* - A **25% reduction** in PTH after 10 minutes is generally considered **insufficient** to confirm successful removal of the hyperfunctioning gland. - This level of reduction may suggest incomplete removal or the presence of additional hypersecreting tissue. *25% reduction in PTH after 5 minutes* - While an initial drop may be observed, a **25% reduction after only 5 minutes** without further significant decline by 10 minutes is often not indicative of successful surgery. - The standard MIBI-scan-guided protocol or the Miami criteria require a more substantial and sustained drop. *50% reduction in PTH after 5 minutes* - A rapid and significant **50% reduction after 5 minutes** of excision is a good sign but the gold standard for intraoperative PTH monitoring typically requires the **10-minute post-excision** sample to confirm the sustained drop. - The **Miami Criteria**, a widely accepted protocol, uses the 10-minute post-excision time point as a critical determinant.

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**.

Question 1

What surgical procedure is indicated for a patient with symptomatic pheochromocytoma?

Accepted Answer

Adrenalectomy

Answer

Pancreatectomy

Answer

Thyroidectomy

Answer

Parathyroidectomy

Question 2

A 35-year-old female with a history of Graves' disease is scheduled for a total thyroidectomy. Which of the following strategies is the most critical to minimize complications during the procedure?

Accepted Answer

Intraoperative nerve monitoring to prevent recurrent laryngeal nerve injury.

Answer

Ensuring a rapid surgical procedure.

Answer

Conducting routine preoperative blood work.

Answer

Discharging the patient immediately after surgery.

Question 3

A patient undergoing a thyroidectomy is at risk of hypocalcemia post-operation due to the accidental removal of which glands?

Accepted Answer

Parathyroid glands

Answer

Pituitary glands

Answer

Thyroid glands

Answer

Adrenal glands

Question 4

Which of the following statements about retrosternal goiter is correct?

Accepted Answer

Surgical decision depends on patient symptoms, goiter size, and potential complications

Answer

Blood supply is exclusively from the thyroid arteries

Answer

Surgical intervention is always recommended regardless of symptoms

Answer

Most cases can be removed via cervical incision alone

Question 5

What is the most appropriate treatment for a malignant thyroid nodule with lymphadenopathy?

Accepted Answer

Total thyroidectomy with modified radical neck dissection

Answer

Radiation therapy

Answer

Surgical excision of the nodule

Answer

Chemotherapy

Question 6

What is the initial investigation of choice for a thyroid nodule with increased radioisotope uptake?

Accepted Answer

Clinical observation

Answer

Treatment of hyperthyroidism

Answer

Repeat thyroid scan in 6-12 months

Answer

FNAC

Question 7

Parathyroid autoimplantation takes place in which muscle?

Accepted Answer

Brachioradialis

Answer

Triceps

Answer

Sartorius

Answer

Sternocleidomastoid

Question 8

In a patient with parathyroid adenoma, how do we confirm the removal of the correct gland after surgery?

Accepted Answer

50% reduction in PTH after 10 minutes

Answer

25% reduction in PTH after 10 minutes

Answer

25% reduction in PTH after 5 minutes

Answer

50% reduction in PTH after 5 minutes

Question 9

Which statement about retrosternal goiter is correct?

Accepted Answer

CT chest is recommended for evaluation of retrosternal goiter.

Answer

Surgery should be avoided in all cases.

Answer

All patients require surgical intervention.

Answer

Blood supply primarily comes from the thyroid arteries.

Question 10

Chvostek sign could be seen after -

Accepted Answer

Total Thyroidectomy

Answer

Subtotal Thyroidectomy

Answer

Heller's Cardiomyotomy

Answer

Gastrojejunostomy

Endocrine Surgery — MCQs

Endocrine Surgery — MCQs

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