Adenomatous tumors of the temporal bone are rare neoplasms. This article records the 40-year course of a patient with adenocarcinoma of the temporal bone and reviews the literature pertinent to the biologic behavior, histologic appearance, prognosis, and treatment of this group of tumors. (Arch Otolaryngol Head Neck Surg. 1991; 117:439-441) © 1991, American Medical Association. All rights reserved.