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Overview

An abdominal aortic aneurysm is a localized dilatation of the abdominal aorta, that exceeds the normal diameter of the abdominal aorta by more than 50%. The normal diameter of an aorta depends on the patient's age, sex, height, weight, race, body surface area, and baseline blood pressure. On average, the normal diameter of the infrarenal aorta is 2 cm, and therefore a true AAA measures 3.0 cm or more. Aortic ectasia is a mild generalized dilatation (<50% of the normal diameter of ≤ 2.9 cm) that is due to age-related degenerative changes in the vessel walls