We report a case of carcinosarcoma of the bladder in a 78 year-old female patient. Carcinosar-voma is a tumor consisting of malignant epithelial and mesenchymal elements, which occurs rarely in the bladder. The prognosis of bladder carcinosarcoma is poor and the best methods of treatment are uncertain. The literature is reviewed and the clinicopathologic condition of carcimosarcoma of the bladder id discussed.