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Updated: Sep 13, 2025

An Orthotopic Bladder Cancer Model for Gene Delivery Studies
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A Rare Case of Ewing Sarcoma Presenting in the Adult Bladder-Treatments and Need for More Discussion
Irene W Choi1, Kristin M Ebert1, Qinyuan Li2
1Division of Pediatric Urology, Department of Urology, University of Wisconsin School of Medicine and Public Health, Madison, WI.
Abstract:
Ewing sarcoma (ES) is a rare, aggressive malignancy seldom found in the urinary bladder. We report a 33-year-old male diagnosed with extra-skeletal ES of the bladder following symptoms initially attributed to prostatitis. Despite multimodal therapy-chemotherapy, radiation, and partial cystectomy-he developed early widespread metastases and died within a year. Pathology revealed positive surgical margins and limited treatment response. This case highlights the diagnostic and therapeutic complexity of bladder ES, the importance of surgical margin status, and the patient's autonomy in surgical decision-making. Novel therapeutic strategies and multidisciplinary approaches are essential for improving outcomes in rare presentations of ES.
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