[Carcinosarcoma of the urinary bladder].

A female patient is presented who had a large carcinosarcoma of the urinary bladder that became clinically manifest only 2 months before treatment. The initial treatment by transurethral resection was followed by radical cystectomy; 7 months postoperatively the patient died of local tumour recurrence with widespread metastases. Carcinosarcoma of the urinary bladder is a rare tumour with a poor prognosis. The majority of such tumours are not diagnosed until tumour growth is already far advanced. Owing to the small number of cases there is no clinically proven form of management. In contrast with superficial transitional cell carcinoma of the bladder, superficial carcinosarcoma of the bladder has always invaded the lamina propria, since in addition to the carcinomatous degeneration of the mucosa, sarcomatous degeneration of the underlying submucosal stroma is also present. Any local surgical treatment, such as TUR or partial cystectomy, involves the risk of incomplete tumor removal, because the sarcomatous elements typically invade the submucosa while the overlying mucosa remains intact. Therefore, radical cystectomy appears to be the treatment of choice for both superficial and invasive carcinosarcoma of the urinary bladder.