Coexistence of aldosteronoma and pheochromocytoma in an adrenal gland

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Abstract
An extremely rare case is reported in which aldosteronoma and pheochromocytoma coexisted in an adrenal gland. Although the patient presented with clinical features of primary aldosteronism, preoperative examination showed an elevation of both plasma aldosterone and urinary catecholamines. Histology of the removed adrenal gland revealed that, concurrently with a round mass of adrenocortical adenoma, the adrenal medulla was totally occupied by the typical structure of pheochromocytoma.