Mixed pheochromocytoma and ganglioneuroma of the adrenal medulla: a case report with electron microscopic examination.

The combination of pheochromocytoma and ganglioneuroma is a rare tumor within the adrenal medulla. This report describes a 37-year-old woman with a 5-year history of paroxysmal attacks of hypertension, headache, and palpitation. No elevated catecholamine levels could be detected. Angiography showed the tumor in the right adrenal gland; the gland was surgically removed. The patient has remained well and free of hypertensive attacks for more than 2 years. Light and electron microscopic findings of the tumor are described.