Thirty patients presenting malignant adrenal tumors of which 19 women aged 3-70 years, and eleven men with ages ranging from 5 to 70 years, are operated in the clinic of endocrine surgery over the period 1965 through 1992. In 16 cases the neoplasm is located on the right side, and in thirteen--on the left side. In 26 patients it is a matter of primary tumor, and in four--metastasis. Ten patients present the clinical picture of corticosteroma, three--pheochromocytoma, and four--corticoandrosteroma. The neoplastic mass extirpated weighs from 69 to 2050 g, necessitating the performing of nephrectomy in six instances, and splenectomy--in two. The operative technique used, intra- and postoperative complications, and the early and late postoperative survival in the series reviewed are analyzed.