Sarcomatoid carcinomas of the bladder constitute a minor part of bladder tumors and are characterized by high potential for malignancy. Very aggressive and occurring predominantly in men, these tumors have both urothelial and sarcomatoid components. Given the rarity of cases described in the literature, there are no clear guidelines on the treatment of these tumors but it seems that radical cystectomy with extended pelvic lymphadenectomy is generally preferred. The article describes a clinical case of sarcomatoid carcinoma of the bladder.