Carcinosarcoma of the kidney (nephroblastoma in an adult). Case report.

There was reported a case of a 57-year-old man with right renal colics and haematuria for the past 12 years, supposed to be caused by renal cysts and pyelonephritis. The latest echographs and functional explorations show an expanded right kidney with frequent cysts. The extirpated kidney is about 12/15 cm in size and has an encephaloid tumour in the pyelocalycial areas penetrating in the surrounding parenchyma. The histological picture is that of a carcinosarcoma, showing a possible origin in the restant multipotent cells of the nephrogenic blastoma.