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©2013 UpToDate ® Print Email Aortoduodenal fistula The CT scan comes from a 75-year-old patient with a history of AAA repair who presented with massive lower gastrointestinal bleeding, and hypotension. An aortoduodenal fistula is demonstrated by a CT scan, which shows a break in the wall of the aorta (arrow) and high density hematoma in the aorta (arrowhead). In image B, air can be seen tracking between the duodenum and the aorta (arrow). CT: computed tomography; AAA: abdominal aortic aneurysm; GI: gastrointestinal.