How are abdominal aortic aneurysms (AAAs) defined?

Updated: Jan 08, 2019
  • Author: Saum A Rahimi, MD, FACS; Chief Editor: Vincent Lopez Rowe, MD  more...
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Abdominal aortic aneurysms (AAAs) are relatively common and are potentially life-threatening. Aneurysms are defined as a focal dilatation in an artery, with at least a 50% increase over the vessel’s normal diameter. Thus, enlargement of the diameter of the abdominal aorta to 3 cm or more fits the definition.

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