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from Section 6 - Gastrointestinal Emergencies
Published online by Cambridge University Press: 02 November 2023
Abdominal aortic aneurysm (AAA) refers to aortic dilatations of > 3 cm. True AAA is a localized dilatation of the aorta caused by weakening of the aorta wall involving all three layers (intima, media and adventitia). False aneurysms or pseudoaneurysms typically occur at sites of vessel injury that allow blood to leak out from the arterial lumen while remaining enclosed by adventitia or surrounding soft tissue.
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