Vesicocolic fistula formed by "collision" tumor between transitional cell carcinoma of urinary bladder and adenocarcinoma of the sigmoid colon.

A patient with vesicosigmoid fistula due to "collision" tumor between adenocarcinoma of the sigmoid colon and transitional cell carcinoma of the urinary bladder is presented. Resection of the sigmoid colon and partial cystectomy were performed. The clinical symptoms, diagnostic procedures and treatments are discussed.