<prompt> 70 year old man has abdominal pain with mass in abdomen. Angiography reveals aneurysm of aorta. Most likely cause is:TraumaAtherosclerosisSyphilisCongenital  <response>: Ans. is b Atherosclerosis Most common cause of abdominal aortic aneurysm - Atherosclerosis 90.Other frequently asked questions about aortic aneurysm.Most common cause of aortic aneurysm overall Atherosclerosis. Most common cause of ascending aortic aneurysm Cystic medial necrosis. Most common cause of descending aortic aneurysm Atherosclerosis. Most common cause of aneurysm of aortic arch Atherosclerosis. Syphilitic aneurysm affect Ascending aorta. Aneurysm of Takayasu arteritis affects Aortic arch. 