Carcinosarcoma of the urinary bladder in a 64-year-old man is described. Total cystectomy with bilateral ureteroileostomy was performed. The patient is in good health 12 months after the operation. Histologically the main bulk of the tumour tissue was rhabdomyosarcomatous, but in some areas atypical glands were intermingled with the rhabdomyoblasts. This histologic pattern has not previously been described. The histologic features, clinical manifestations and treatment of these rare bladder tumours are discussed in relation to the literature.
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