Two unique cases of primary aortoenteric fistula following a small aneurysm and penetrating ulcer of the abdominal aorta

A primary aortoenteric fistula (PAEF) is a rare condition, and its associated mortality has remained high. We have presented two challenging cases of PAEF related to a small abdominal aortic aneurysm and an abdominal penetrating aortic ulcer. In both cases, a definite diagnosis was established intraoperatively, and the PAEF was repaired with in situ aortic reconstruction. Despite the successful outcome for the first patient, the postoperative complications were fatal for the second patient. The diagnosis of PAEF requires high suspicion and should be a part of the differential diagnosis in every case of gastrointestinal bleeding, especially when a history of, or risk factors for, aortic pathology are present.