Definition: An abnormal balloon- or sac-like dilatation in the wall of the ABDOMINAL AORTA which gives rise to the visceral, the parietal, and the terminal (iliac) branches below the aortic hiatus at the diaphragm.
dissecting aneurysm: coordinate IM with ANEURYSM, DISSECTING (IM); rupture: coordinate IM with AORTIC RUPTURE (IM)