Definition of pheochromocytoma
: a tumor that is derived from chromaffin cells and is usually associated with paroxysmal or sustained hypertension Pheochromocytoma is a rare cause of hypertensive crisis. The hypertension may be either sustained or paroxysmal, with episodes of headache, diaphoresis, palpitations, anxiety, nausea, vomiting, and abdominal pain.— David A. Calhoun et al.
— called also pheo
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