A 27-year old woman comes to the physician because of a 3-month history of intermittent headaches and palpitations. Her

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A 27-year old woman comes to the physician because of a 3-month history of intermittent headaches and palpitations. Her initial blood pressure is 125/80 mm while she sits in a chair. When asked to sit on the examination table, she has facial flushing, and her blood pressure increases to 185/115 mm Hg. Physical examination shows no other abnormalities. Which of the following is the most likely diagnosis?


A) Coarctation of the aorta
B) Hyperthyroidism
C) Pheochromocytoma
D) Primary aldosteronism
E) Renovascular hypertension