A 65-year-old man was admitted to our clinic with the chief complaint of gross hematuria and burning on urination. Cystoscopy revealed a papillary broad base tumor on right lateral and posterior wall. Barium enema showed a tumor of sigmoid colon. The other gastrointestinal and genitourinary tracts were examined but no tumor lesion could be found. Total cystectomy and partial resection of sigmoid colon were done, and the urinary tract was reconstructed using a Kock continent ileal reservoir. Histological findings revealed adenocarcinoma of its infiltration to the sigmoid colon.