A Case Report of Synchronous Prostate Cancer and Rectal Gastrointestinal Stromal Tumor and its Management.

A 72-year-old Japanese man presented to the hospital with complaints of gross hematuria. Contrast enhanced com-puted tomography revealed a broad-based, approximately 3-cm bladder tumor near the right ureteral orifice and a 5-cm mass located between the prostate and rectum. The patient underwent transurethral resection of the bladder tumor and a transrectal biopsy of the lesion. Histological examination of the specimens suggested that the patient had a muscle invasive adenocarcinoma from transurethral resection and a rectal gastrointestinal stromal tumor in TRUS biopsy. Patient underwent total pelvic exenteration and ileal and colonic stomas to divert urine and faeces. Final pathology report of the resected specimen revealed a rectal gastrointestinal stromal tumor and prostatic ad-enocarcinoma, which had invaded the urinary bladder and seminal vesicles. Synchronous gastrointestinal stromal tumor in rectum and prostate cancer treated with total pelvic exenteration has not been reported before in literature.