Ectopic adrenal oncocytoma simulating a segment I tumor: A case report

Abstract

Oncocytomas are tumors consisting exclusively or almost exclusively of oncocytic cells. Their localization in the adrenal gland and especially in the ectopic adrenal gland is extremely rare. It is often a benign tumor, non-functional and of fortuitous discovery. We report the case of a 48 year old female patient who presented with abdominal pain. The general examination showed a patient in good general condition, vitals were normal, the physical examination was normal. The abdominal CT and MRI scans were in favor of a segment I HCC. Surgical exploration found a 4cm mass on the anterior aspect of the inferior vena cava under segment I of the liver. A resection of the mass flush with the vena cava was performed. The postoperative course was simple. Anatomopathological examination concluded that the mass was an ectopic adrenal oncocytoma. Ectopic adrenal oncocytoma is a very rare tumor, often benign. Its treatment is always surgical and its diagnosis is based on histological and immunochemical studies.