Aneurysmal dilatation of the proximal celiac or SMA can occur in patients with aortic aneurysms. Abdominal aortic aneurysms (AAA) are more commonly associated with iliac, common femoral, and popliteal artery aneurysms. Isolated aneurysms can also involve the splenic, hepatic, gastro-duodenal, gastric, gastro-epiploic, and inferior mesenteric arteries. Splenic artery aneurysms are the most common, particularly in post-partum women or secondary to weakening of the splenic artery from pancreatitis. SMA aneurysms are often mycotic as a result of proximity to the small intestine. Aneurysmal dilatation of the celiac axis may occur secondary to post-stenotic dilatation related to either atherosclerotic narrowing of the origin or narrowing from extrinsic compression by the median arcuate ligament.
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