Digestive haemorrhage (HD) is a frequent reason for consultation at the Emergency Department. Approximately 80% of GI haemorrhages are upper GI, i.e. related to a lesion located above the angle of Treitz. The main causes are ulcer disease, portal hypertension, gastritis and ulcerated lesions of the stomach, and reflux oesophagitis. In approximately 10% of cases, a rarer cause (Mallory-Weiss, acquired vascular malformations, Dieulafoy, primary PAEF or secondary aortodigestive fistulas, biliary or pancreatic tract anomalies, tumours,...) is responsible. We report the case of a patient with high HD in whom aortoduodenal fistula was the cause diagnosed on abdominal CT.