appendicovesical fistula is an uncommon type of enterovesical fistula and a rare complication of unrecognized appendicitis. appendicovesical fistula often presents with recurrent or persistent urinary tract infection, especially in men. the commonest causes are appendicitis, cecal diverticulitis, and cystadenocarcinoma or carcinoid tumors of appendix. approximately 114 cases have been reported ...