Incidental adrenocortical oncocytoma.

A 66-year-old man with a history of hypertension and poor compliance with therapeutic regimens for the past 10 years presented with right renal colic. Sonographic evaluation of the kidneys revealed an incidental left renal upper pole mass. There were no palpitations, headache, weakness or fatigue, and the physical examination was unremarkable. Further evaluation including laboratory tests, abdominal computed tomography scan and magnetic resonance imaging revealed a non-functioning left adrenal mass with no malignant characteristic. Laparascopic left adrenalectomy and subsequent pathologic examination demonstrated a 8×6.5×4 cm oncocytoma. Follow-up of the patient for 1 year has revealed no complication or recurrence. Adrenocortical oncocytoma is an exceptionally rare tumour, mainly non-functional and benign, that should be considered in the differential diagnosis of adrenal "incidentalomas".