<prompt> In a 27-year-old male, most common cause of a colovesical fistula would be:Crohns diseaseUlcerative colitisTBCancer colon  <response>: Ans. a Crohns diseaseRef: Sabiston 19th edition, Pages 1247, 1313 Young male most common cause of colovesical fistula: CD Old age most common cause of colovesical fistula: Diverticular disease Overall most common cause is diverticulitis 