[A Case of Bladder Squamous Cell Carcinoma Following LONG-Term-Indwelling Cystostomy].

A man in his 50s with an intellectual disability underwent a cystostomy for neurogenic bladder, followed by regular catheter exchange. Eighteen years later, the patient developed hematuria. Computed tomography and cystoscopy revealed a bladder tumor despite negative urinary cytology. Transurethral resection of the tumor confirmed the diagnosis of squamous cell carcinoma. Radical cystectomy was performed due to muscle invasion. Histopathological analysis revealed a pT3aN1M0 squamous cell carcinoma. No adjuvant therapy was administered, and the patient has remained recurrence-free for seven years postoperatively.