Endocrine Surgery Practice Questions

Q: A 67-year-old woman with tertiary hyperparathyroidism and end-stage renal disease on hemodialysis has persistent hypercalcemia (calcium 12.8 mg/dL) despite maximal medical management with cinacalcet and vitamin D restriction. She has severe pruritus, calciphylaxis, and vascular calcifications. All four parathyroid glands are enlarged on imaging. Evaluate the optimal surgical strategy considering her complex medical status and need for ongoing dialysis access.

Total parathyroidectomy with forearm autotransplantation. ***Total parathyroidectomy with forearm autotransplantation*** - In **tertiary hyperparathyroidism** with four-gland enlargement, this procedure provides definitive treatment while allowing for easier access if **recurrent hyperplasia** occurs. - Placing the tissue in the **forearm** avoids risky neck re-explorations in the future and is the standard for patients who may remain on long-term dialysis. *Single adenoma resection guided by sestamibi* - This approach is inappropriate because **tertiary hyperparathyroidism** involves **multiglandular hyperplasia**, not a single solitary adenoma. - Imaging with **sestamibi** is less reliable in renal patients, and leaving three hyperplastic glands would lead to surgical failure. *Subtotal parathyroidectomy (3.5 gland resection)* - While a valid option for some, it carries a higher risk of **persistent hypercalcemia** or recurrence within the neck remnant compared to total resection. - In patients with **calciphylaxis** and severe symptoms, many surgeons prefer total resection to ensure immediate clearance of excess **parathyroid hormone**. *Total parathyroidectomy without autotransplantation* - This technique leads to permanent **hypoparathyroidism**, which is difficult to manage and can result in **adynamic bone disease**. - It is generally reserved for patients who are not candidates for future transplantation and have severe, life-threatening **hypercalcemia** where no hormonal replacement is desired. *Medical management escalation with denosumab* - The patient has already failed **maximal medical management** including **cinacalcet**, and her severe **calciphylaxis** is a surgical emergency. - **Denosumab** does not address the underlying autonomous parathyroid hyperplasia and is not a definitive treatment for **tertiary hyperparathyroidism**.

Q: A 30-year-old man presents with a 6 cm adrenal mass discovered incidentally. Biochemical workup shows elevated 24-hour urine metanephrines and plasma free metanephrines. He also has elevated serum calcium, PTH, and a pancreatic head mass on CT. Genetic testing confirms MEN 2B syndrome. Evaluate the management priorities and sequencing of interventions.

Adrenalectomy first, then thyroidectomy, then other tumors. ***Adrenalectomy first, then thyroidectomy, then other tumors*** - Prioritizing **pheochromocytoma** resection is critical to avoid a life-threatening **hypertensive crisis** during subsequent surgeries. - Adequate medical preparation with **alpha-blockade** followed by beta-blockade is mandatory before any surgical intervention in these patients. *Simultaneous thyroidectomy and bilateral adrenalectomy* - Simultaneous procedures significantly increase **perioperative risk** and operative time without ensuring hemodynamic stability during the thyroid portion. - Managing the **catecholamine surge** from a pheochromocytoma is safer when performed as a separate, initial stage. *Medical management of pheochromocytoma then parathyroidectomy* - While **alpha-blockade** is necessary, the question asks for the sequence of surgical interventions, where adrenalectomy must precede other operations. - This patient presents with features suggestive of **MEN 2B**, which classically does not include hyperparathyroidism, unlike **MEN 1** or **MEN 2A**. *Immediate thyroidectomy followed by staged procedures* - Performing a **thyroidectomy** first is contraindicated because the stress of surgery and anesthesia can trigger a **pheochromocytoma crisis**. - Even if medullary thyroid carcinoma is aggressive, the risk of immediate **intraoperative death** from pheochromocytoma takes precedence. *Pancreatic surgery first due to mass effect* - Although a **pancreatic head mass** is present (suggestive of MEN 1 overlap or separate pathology), it is not the immediate life-threatening priority. - Operating on the pancreas before controlling and removing the **pheochromocytoma** exposes the patient to severe hemodynamic instability.

Q: A 55-year-old woman presents with a 4 cm thyroid nodule. FNA shows Hurthle cell neoplasm (follicular variant). Preoperative ultrasound shows no lymphadenopathy. She undergoes thyroid lobectomy, and final pathology reveals a 3.8 cm Hurthle cell carcinoma with capsular invasion but no vascular invasion. Analyze the pathology findings and determine the next step in management.

Completion thyroidectomy within 2 weeks. ***Completion thyroidectomy within 2 weeks*** - For **Hurthle cell carcinoma** (HCC), a completion thyroidectomy is indicated when a malignancy is confirmed post-lobectomy, especially given HCC's aggressive nature and size approaching **4 cm**. - Total thyroidectomy is necessary to facilitate future surveillance using **serum thyroglobulin** levels and to prepare for potential **radioactive iodine (RAI)** therapy if needed. *Radioactive iodine ablation without further surgery* - **Radioactive iodine (RAI)** therapy cannot be effectively performed if a remnant thyroid lobe is still present, as the normal tissue will sequester the iodine. - **Hurthle cells** are historically less iodine-avid than other follicular cells, making surgical clearance of all thyroid tissue even more critical before considering RAI. *Observation with ultrasound surveillance every 6 months* - **Observation** is generally reserved for low-risk papillary microcarcinomas or minimally invasive follicular carcinomas <1-2 cm without high-risk features. - The presence of **capsular invasion** and the histological subtype of **Hurthle cell carcinoma** in a 3.8 cm lesion represent a higher risk that mandates definitive surgical management. *External beam radiation therapy* - **External beam radiation** is not a primary treatment for localized Hurthle cell carcinoma and is typically reserved for **palliative care** or unresectable local recurrence. - It does not replace the standard of care for surgical management of a resectable **thyroid malignancy**. *Prophylactic modified radical neck dissection* - **Prophylactic neck dissection** is not recommended for Hurthle cell carcinoma because it primarily spreads **hematogenously** rather than through lymphatic channels. - Surgical management of the neck is only indicated if there is clinical or radiological evidence of **cervical lymphadenopathy**, which was absent in this patient.

Q: A 42-year-old woman with a family history of pheochromocytoma undergoes resection of a 5 cm right adrenal mass. Preoperatively, she was adequately alpha-blocked with phenoxybenzamine. During tumor manipulation, her blood pressure rises to 220/130 mmHg despite anesthesia deepening. Immediately after tumor removal, her blood pressure drops to 70/40 mmHg. Analyze the hemodynamic changes and determine management priorities.

***Immediate aggressive fluid resuscitation and vasopressors*** - Sudden **hypotension** after tumor removal occurs because the body is no longer receiving the massive surge of **catecholamines** while existing **alpha-blockade** (phenoxybenzamine) persists. - Management requires **large-volume intravenous fluids** to address pre-existing **volume depletion** and vasopressors to maintain mean arterial pressure until the vascular tone is restored. *Continue phenoxybenzamine and observe* - Phenoxybenzamine is a **non-competitive alpha-antagonist** used preoperatively to control hypertension; it has a long half-life and cannot be reversed quickly. - Continuing observation without intervention in a patient with a blood pressure of **70/40 mmHg** would lead to organ malperfusion and **cardiovascular collapse**. *Administer phentolamine for hypertensive crisis* - Phentolamine is appropriate for managing the **intraoperative hypertensive surge** caused by tumor manipulation, but it is contraindicated once the patient is hypotensive. - Giving a vasodilator during the post-resection **hypotensive phase** would exacerbate the low blood pressure and worsen the clinical state. *Emergency re-exploration for bleeding* - Although postoperative hemorrhage is a concern, the timing of this collapse matches the **physiologic withdrawal** of catecholamines precisely upon ligation of the adrenal vein. - Hemodynamic instability should first be treated with **fluid boluses** and pressors; surgical re-exploration is reserved for confirmed cases of **hemoperitoneum**. *Decrease anesthesia depth and give beta-blockers* - Decreasing anesthesia depth may help slightly with blood pressure but is insufficient to counteract the loss of **endogenous vasopressors**. - Giving **beta-blockers** in the setting of hypotension is dangerous as it reduces **cardiac output** and compensatory tachycardia, further decreasing blood pressure.

Question 1

A 67-year-old woman with tertiary hyperparathyroidism and end-stage renal disease on hemodialysis has persistent hypercalcemia (calcium 12.8 mg/dL) despite maximal medical management with cinacalcet and vitamin D restriction. She has severe pruritus, calciphylaxis, and vascular calcifications. All four parathyroid glands are enlarged on imaging. Evaluate the optimal surgical strategy considering her complex medical status and need for ongoing dialysis access.

Accepted Answer

Total parathyroidectomy with forearm autotransplantation

Answer

Single adenoma resection guided by sestamibi

Answer

Subtotal parathyroidectomy (3.5 gland resection)

Answer

Total parathyroidectomy without autotransplantation

Answer

Medical management escalation with denosumab

Question 2

A 30-year-old man presents with a 6 cm adrenal mass discovered incidentally. Biochemical workup shows elevated 24-hour urine metanephrines and plasma free metanephrines. He also has elevated serum calcium, PTH, and a pancreatic head mass on CT. Genetic testing confirms MEN 2B syndrome. Evaluate the management priorities and sequencing of interventions.

Accepted Answer

Adrenalectomy first, then thyroidectomy, then other tumors

Answer

Simultaneous thyroidectomy and bilateral adrenalectomy

Answer

Medical management of pheochromocytoma then parathyroidectomy

Answer

Immediate thyroidectomy followed by staged procedures

Answer

Pancreatic surgery first due to mass effect

Question 3

A 38-year-old woman with primary hyperparathyroidism (calcium 11.8 mg/dL, PTH 185 pg/mL) has negative sestamibi scan and ultrasound. She desires surgical cure and has no medical contraindications. She has a Z-score of -2.8 on DEXA scan and a history of recurrent kidney stones. Evaluate the surgical approach and expected outcomes.

Accepted Answer

Bilateral neck exploration with identification of all four glands

Answer

Defer surgery until localization studies are positive

Answer

Minimally invasive parathyroidectomy of the largest gland

Answer

Medical management with cinacalcet and bisphosphonates

Answer

Intraoperative PTH-guided focused exploration

Question 4

A 55-year-old woman presents with a 4 cm thyroid nodule. FNA shows Hurthle cell neoplasm (follicular variant). Preoperative ultrasound shows no lymphadenopathy. She undergoes thyroid lobectomy, and final pathology reveals a 3.8 cm Hurthle cell carcinoma with capsular invasion but no vascular invasion. Analyze the pathology findings and determine the next step in management.

Accepted Answer

Completion thyroidectomy within 2 weeks

Answer

Radioactive iodine ablation without further surgery

Answer

Observation with ultrasound surveillance every 6 months

Answer

External beam radiation therapy

Answer

Prophylactic modified radical neck dissection

Question 5

A 42-year-old woman with a family history of pheochromocytoma undergoes resection of a 5 cm right adrenal mass. Preoperatively, she was adequately alpha-blocked with phenoxybenzamine. During tumor manipulation, her blood pressure rises to 220/130 mmHg despite anesthesia deepening. Immediately after tumor removal, her blood pressure drops to 70/40 mmHg. Analyze the hemodynamic changes and determine management priorities.

Answer

Immediate aggressive fluid resuscitation and vasopressors

Answer

Continue phenoxybenzamine and observe

Answer

Administer phentolamine for hypertensive crisis

Answer

Emergency re-exploration for bleeding

Answer

Decrease anesthesia depth and give beta-blockers

Endocrine Surgery — MCQs

Endocrine Surgery — MCQs

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