Most common cause of Abdominal Aoic Aneurysm is:
The abdominal aoa is commonly afftected by atheroma by the process of atherosclerosis. This atheroma causes intimal weaking leading to aneurysm. so atherosclerosis is the leading cause for Abdominal Aoic Aneurysm. Ref: Encyclopedia of Hea Diseases By M. I. Gabriel Khan. 2006, Page 27
Atherosclerosis
Trauma
Syphilis
Vasculitis