A pheochromocytoma (from Greek phaios dark chroma color kytos cell -oma tumor) or phaeochromocytoma (PCC) is a neuroendocrine tumor of the medulla of the adrenal glands (originating in the chromaffin cells) or extra-adrenal chromaffin tissue that failed to involute after birth and secretes high amounts of catecholamines mostly norepinephrine plus epinephrine to a lesser extent.
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