[Leiomyosarcoma originating in the renal vein. A special case]. / Leiomiosarcoma originado en vena renal. Un caso especial.

OBJECTIVES: An additional case of leiomyosarcoma of the renal vein is presented and the literature reviewed. METHODS/RESULTS: The patient had a history of hypertension. He and his brother were the first case of twins with bilateral retinoblastoma reported in the literature. The pathological findings were diagnostic of leiomyosarcoma of the renal vein. The clinical features, diagnosis and treatment are discussed. CONCLUSIONS: Leiomyosarcoma of the renal vein is an uncommon tumor which presents difficulties in making the preoperative diagnosis. A possible relationship may exist between this tumor type and the radiotherapy administered during childhood due to retinoblastoma.