[Extrarenal retroperitoneal epithelioid angiomyolipoma: a case report]

We present a very rare case of retroperitoneal extrarenal epithelioid angio-myolipoma (AML). A 64-year-old man without tuberous sclerosis was admitted to our hospital for further examination of an abdominal mass lesion. Imaging analyses revealed a heterodensity and heterointensity retroperitoneal mass covering the left renal surface by ultrasonography, computed tomography and magnetic resonance imaging. Surgical exploration was done, and the tumor was resected with the left kidney radically. Histopathologically high cellular atypia was remarkable, and diagnosis was extrarenal epithelioid AML because of consistent immunostaining positive for HMB-45.