Adrenocortical oncocytoma--a case report.

Oncocytic tumours of adrenal gland are rare lesions with approximately twenty-five cases being documented in literature. A majority of them are nonfunctional and benign. We report a case of adrenal oncocytoma in a 44-year-old male, who underwent a laparotomy for a large mass in the abdomen, which was located above the left kidney. Routine histopathological examination was suggestive of a benign tumour with cells resembling oncocytes. However, immunohistochemistry and electron microscopy helped to confirm the diagnosis of an adrenocortical oncocytoma.