A 50-year-old woman was the victim of a motor vehicle accident. An aortogram obtained for suspicion of an aortic injury was interpreted as an intimal disruption at the level of the aortic isthmus. At thoracotomy the patient was found to have only a ductus diverticulum. A brief discussion of the angiographic appearance of a ductus diverticulum and its significance in the setting of trauma is presented.