What are the less common causes of abdominal aortic aneurysm (AAA)?

Updated: Jan 08, 2019
  • Author: Saum A Rahimi, MD, FACS; Chief Editor: Vincent Lopez Rowe, MD  more...
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Less frequent causes of AAA include Marfan syndrome, Ehlers-Danlos syndrome, and collagen-vascular diseases. In fewer than 5% of cases, AAA is caused by mycotic aneurysm of hematogenous origin. In these cases, local invasion of the intima and media gives rise to abscess formation and aneurysmal dilation of the vessel. Gram-positive organisms most commonly cause mycotic aneurysms. Other uncommon causes include cystic medial necrosis, arteritis, trauma, and anastomotic disruption producing pseudoaneurysms.

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