intestinal fistula http://purl.bioontology.org/ontology/MEDDRA/10022647 http://purl.bioontology.org/ontology/MESH/D007412 http://purl.obolibrary.org/obo/HP_0100819 http://purl.obolibrary.org/obo/NCIT_C34732 An abnormal anatomical passage between the intestine, and another segment of the intestine or other organs. External intestinal fistula is connected to the skin (enterocutaneous fistula). Internal intestinal fistula can be connected to a number of organs, such as stomach (gastrocolic fistula), the biliary tract (cholecystoduodenal fistula), or the urinary bladder of the urinary tract (colovesical fistula). Risk factors include inflammatory processes, cancer, radiation treatment, and surgical misadventures. intestinal fistulae intestinal fistulas digestive system fistula