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We reported a case of sarcomatoid carcinoma of the bladder in a 78-year-old woman presenting with pollakisuria. She has remained well without any evidence of recurrence for 25 months after radical cystectomy. Microscopic examination revealed a composition almost exclusively of spindle and dedifferentiated cells, accompanied by only a few cells retaining epithelial features of differentiation. The latter cells were immunohistochemically positive for epithelial membrane antigen (EMA). A concomitant carcinoma in situ was present in the adjacent mucosa. Immunohistochemical exploration with EMA proved useful for reinforcing the conventional histological diagnosis.
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