• Shuo Wu, Xiaolong Wang, Yuliang Zuo, Kuan Wang, Meihong Ye, and Chaoming Wang.
• Department of Urology, Huanghe Sanmenxia Hospital Affiliated to Henan University of Science and Technology, Sanmenxia, Henan Province, China.
• Medicine (Baltimore). 2024 Aug 9; 103 (32): e39225e39225.

RationaleBladder carcinosarcoma (BC) is a malignant tumor composed of a mixture of malignant epithelial and stromal components. Carcinosarcoma mostly occurs in the upper respiratory tract and upper gastrointestinal tract and is less common in the urinary system. The incidence of malignant tumors of the urinary system is <3%. It rarely occurs in the bladder and accounts for approximately 0.31% of all malignant bladder tumors. A literature review and this report will help to further improve our understanding, diagnosis, and treatment of bladder carcinosarcoma (BC).Patient ConcernWe describe the case of an 80-year-old female patient who was admitted to the hospital with a history of intermittent hematuria for 3 years. Furthermore, total cystectomy was refused when a BC was diagnosed. Palliative resection surgery was necessary because of the recurrent hematuria and abdominal pain.DiagnosesPathologically confirmed BC after surgery.InterventionsThe patient's first transurethral resection of bladder tumor (TURBT) was diagnosed as BC. However, the patient refused a total cystectomy. Two months after intravesical treatment with epirubicin, bladder tumor recurrence was observed during follow-up cystoscopy. The patient underwent a second TURBT for hemostatic treatment due to persistent hematuria. Due to hematuria and abdominal pain, a third TURBT was performed to reduce tumor size and stop bleeding. Finally, tumor recurrence resulted in bilateral hydronephrosis, and the patient underwent bilateral renal catheter drainage guided by B-ultrasound.OutcomesBladder carcinosarcoma caused uremia, electrolyte imbalance, and sepsis. Approximately 19 months after the discovery of the tumor, the patient died.LessonsRadical bladder resection is recommended once a BC is diagnosed. By reporting the cases and reviewing the literature in the database, we will summarize the epidemiology, origin, etiology, clinical features, existing treatments, and prognostic factors of BC, and propose new prospects for BC therapy.Copyright © 2024 the Author(s). Published by Wolters Kluwer Health, Inc.

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