Abstract
Compared with bladder urothelial cell carcinoma, the incidence of bladder undifferentiated sarcoma and bladder sarcomatoid carcinoma is low, and the number of cases is rare. The lack of studies with larger samples has led to insufficient understanding of these diseases. It is even rarer to report that these two types of diseases occur simultaneously in the bladder of a patient. Radical cystectomy does not seem to delay the recurrence and metastasis of the tumor. Whether adjuvant chemoradiotherapy is needed in a timely manner and the timing of the corresponding treatment need to be further studied.