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171966 Pathology

A 34-year-old man complains of sudden attacks of dizziness, blurred vision, and excruciating headaches of 4 months in duration. During one of these attacks, his blood pressure was 180/120 mm Hg. The patient’s father had been treated for thyroid cancer about 15 years ago. Laboratory studies show normal serum levels of aldosterone, renin, and angiotensin. A 24-hour urinalysis reveals increased metanephrines. Episodic hypeension in this patient is most likely caused by a tumor in which of the following endocrine organs?

AAdrenal
BKidney
CParathyroid
DPituitary
Pathology
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