Primary aortoduodenal fistula without an abdominal aortic aneurysm: A case report

Introduction. Aortoenteric fistula is a communication between the aorta and segments of the gastrointestinal tract. Primary aortoduodenal fistula is an extremely rare cause of gastrointestinal bleeding associated with a high mortality rate. Case Report. We report a case of a 63-year-old man admitted due to abdominal pain lasting for a week. Abdominal ultrasound and computed tomography angiography revealed an aortoduodenal fistula without an aortic aneurysm. Conclusion. This case is an example of a rare cause of gastrointestinal bleeding, as well as presentation of aortoduodenal fistula that was not caused by an abdominal aortic aneurysm.