Crohn’s disease can cause anal fistulas, which are tunnels that go from your anus to the surface of the skin around your anus ...

Secondary aortoenteric fistula (SAF) is an uncommon but very important complication of abdominal aortic reconstruction. The complication often occurs months to years after aortic surgery.

including atrio-esophageal fistula leading to air bubbles blocking blood vessels in the brain (cerebral air embolism), stomach and intestinal (gastrointestinal) bleeding, a system-wide infection ...