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. A collective analysis of the few cases of adrenal oncocytoma published in the medical literature showed that our case corresponded to the previously published cases in preponderant location (left side) as well as the general size (11.4 cm in the largest dimension) and weight (372 g).Conclusion: Adrenal oncocytoma should be included in the differential diagnosis of adrenal incidentalomas, especially if large tumors are detected. In addition, a longterm follow-up is suggested because there are no certain...