A fistulous (abnormal) communication between the aorta and the GI tract.
• Primary Über rare, occur de novo, i.e., without prior intraabdominal intervention or surgery, and are typically due to pressure erosion from atherosclerotic plaques in an abdominal aortic aneurysm–AAA
• Secondary Relatively common–0.4% to 3.1% of recipients of stent grafts for AAA repair, complication of aortic reconstructive surgery.
Diagnosis Aortoenteric fistula is diagnosed by the presence of periaortic ectopic gas 3 or more weeks after surgery or endovascular repair.
Cleveland Clin J of Med 2013; 80:363-8