Occlusion of branches of the abdominal aorta may be Acute: Resulting from embolism, atherothrombosis, or dissection Chronic: Resulting from atherosclerosis, fibromuscular dysplasia, or external compression by mass lesions Common sites of occlusion include Superior mesenteric arteries Celiac axis Renal arteries Aortic bifurcation Chronic occlusion of the celiac axis is more common among women for unclear reasons.