Large adrenal oncocytoma with uncertain malignant potential: case report and review of literature.

Objective: To report a case of oncocytoma, a relatively rare adrenal tumor, which most commonly is detected as an adrenal incidentaloma.

Methods: We present a case report, including laboratory, imaging, and pathologic findings, of a 47-year-old obese woman who had hypertension and an incidentally found large, left adrenal mass.

Results: On the basis of the hormonal evaluation, this mass was a nonsecreting adrenal tumor, which histologically proved to be an oncocytoma with borderline malignant characteristics.