Pheochromocytoma

Abstract

PHEOCHROMOCYTOMAS are rare tumors that may cause any known form of hypertension. Although the hypertension may be and most commonly is paroxysmal, it may also be nonparoxysmal. In either case, the hypertension may be intermittent or persistent. Pheochromocytomas develop from chromaffin tissue and consequently are found wherever this occurs. The most common location is the medullary portion of the adrenal gland. Tumors also arise from sympathetic-ganglion tissue and consequently may be found in various locations. The most common site of origin other than the adrenal gland is the organ of Zuckerkandl, which is located just above the aortic bifurcation. In . . .