Fistula formed between aorta and intestines
Can be primary or secondary (often due to AAA repair)
Can form fistula anytime within life of AAA graft repair
Higher risk with recent graft placement
Involves the duodenum (ADF) in most cases
Incidence of primary<unk>  fistulas is estimated to be about 0.007 per million while secondary<unk>  fistulas is about 0.6-2%
Mortality of 100% if left untreated
Can be primary or secondary (often due to AAA repair)
Can form fistula anytime within life of AAA graft repair
Higher risk with recent graft placement
Higher risk with recent graft placement
Aortoenteric fisulta
Peptic ulcer disease 
Aortocaval fistula
Gastritis/esophagitis
Intersection syndrome
Gastric/esophageal varices
Angiogram complications
Mallory-Weiss tear