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July 19, 2011
Sometimes atherosclerosis can damage the walls of blood vessels and lead to a situation in which the arteries, including the aorta, develop abnormally widened areas called aneurysms. Aneurysms can occur in virtually any artery, but the segment of the aorta that runs through the abdomen is the most common site of localized ballooning. Other sites of aneurysm are the aorta in the chest and the arteries in the thigh and behind the knee.Causes of Aneurysm. More than 90 percent of abdominal aortic aneurysms are associated with atherosclerosis.Symptoms of Aneurysm. Most abdominal aortic aneurysms do not produce symptoms, but some people feel a pulsating sensation in the abdomen. These silent (asymptomatic) aneurysms are often recognized by careful physical examination, chest X-ray, and ultrasonography. When aneurysms do not cause symptoms and are small, they can be safely watched and do not require surgery. It is important, however, to have periodic evaluations. When aneurysms become larger the chance of sudden rupture is greater, and these should be surgically repaired.*196\252\8*