<prompt> Answer this question truthfullyWhat is the underlying physiological process of Pheochromocytoma?  <response>: <reason> On gross pathology, the characteristic findings of pheochromocytoma are:Small to large tumors usually associated with hemorrhage and necrosis. Usually lobulated Bilateral when familial tumors Associated with hyperplasia in the adjacent medulla. Chromaffin reaction: fresh tumor cut section turns dark brown if add potassium dichromate at pH 5-6.Bilateral pheochromocytoma in MEN2. Gross image. Source: 