The patient was a 62-year-old female with bladder carcinoma. TUR-BT was performed in March 2010, and the pathological finding was UC, G2 > G1, pTa. However, the cancer recurred in the urinary bladder 3 months after TUR-BT. Radical cystectomy was performed, and the disease was considered to have been cured, but metastasis developed in the skin, lung, liver, and bone several months after surgery. Chemotherapy was ineffective, and the patient died. On pathological examination at the time of radical cystectomy, the lesion was sarcomatoid carcinoma of the urinary bladder. Although the prognosis associated with this carcinoma is known to be poor, the possibility of underestimation on preoperative staging cannot be ruled out from the cause, in addition to the insufficiency of the current therapeutic strategy.
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