[Bilateral renal oncocytoma. A clinical case and review of the literature].

Renal oncocytoma is an epithelial tumour of the kidney, originally considered benign neoplasm, but now it is thought have a limited but real malignant or metastatic potential. Usually monolateral, in 6% of cases it is bilateral in a synchronous or metachronous way. A case of bilateral renal oncocytoma in a 56-year-old woman, observed by chance during a follow-up carried out after breast cancer is described. The etiopathogenic and clinical-therapeutic aspects of this neoplasm are examined, and the conclusion is drawn that the most correct therapeutic approach must aim at both the protection of kidney function and complete removal of the tumour.