Bilateral renal oncocytosis treated by nephrectomy

Renal oncocytosis is a rare disorder in which numerous oncocytic nodules develop in the kidney. It is a benign tumor that is occasionally discovered incidentally when performing an imaging test for other reasons. The clinical case of a patient who presented hematuria of 6 months of evolution is presented. After complementary studies, a right renal mass was discovered, for which he underwent radical nephrectomy, with histological result of carcinoma with an oncocytic appearance compatible with chromophobe carcinoma. He presented in the emergency department 3 months after surgery, presenting with anuria accompanied by renal failure. Imaging studies were again requested and a mass dependence on the left kidney was observed. The same surgical procedure was performed and histopathological study demonstrated that the lesion removed corresponded to oncocytosis. Both kidneys are evaluated with immunohistochemistry, being definitive of bilateral renal oncocytosis.