vesicointestinal fistula vesicointestinal fistula a vesicointestinal fistula (or intestinovesical fistula) is a form of fistula between the bladder and the bowel. vesicointestinal fistulaother namesintestinovesical fistulaspecialtyurology types a fistula involving the bladder can have one of many specific names, describing the specific location of its outlet: bladder and intestine: "vesicoenteric", "enterovesical", or "vesicointestinal" bladder and colon: "vesicocolic" or "colovesical" bladder and rectum: "vesicorectal" or "rectovesical" symptoms and signs if fecal matter passes through the fistula into the bladder, the existence of the fistula may be revealed by pneumaturia, fecaluria, or recurrent urinary tract infection. migration of urine through the fistula into the bowel may cause rectal passage of urine. causes many causes exist including: diverticulitis : most common ~ 60% colorectal cancer (crc) : ~ 20% crohn's disease : ~ 10% radiotherapy appendicitis trauma diagnosis various modalities of diagnosis are available: cystoscopy colonoscopy poppy seed test transabdominal ultrasonography abdominopelvic ct mri barium enema bourne test cystogram a definite algorithm of tests is followed for making the diagnosis.