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Pheochromocytomas are tumors of the adrenal glands These glands are located right above the kidneys Pheochromocytomas cause the adrenal glands to make too many stress hormones called epinephrines and norepinephrinesPheochromocytomas are a type of paraganglioma They are catecholaminesecreting tumors derived from chromaffin cells They typically demonstrate a nesting (Zellballen) pattern on microscopy This pattern is composed of welldefined clusters of tumor cells containing eosinophilic cytoplasm separated by a fibrovascular stromaA pheochromocytoma (feeokroemoesyTOEmuh) is a rare, usually noncancerous (benign) tumor that develops in an adrenal gland You have two adrenal glands —one located at the top of each kidney Usually, a pheochromocytoma develops in only one adrenal gland But tumors can develop in both Pheochromocytoma In An Incidentally Discovered Asymptomatic Cystic Adrenal Mass Mayo Clinic Proceedings Pheochromocytoma pathology outlines