Acute superior mesenteric artery occlusion
Sudden onset of abdominal pain
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There is a filling defect in the superior mesenteric artery, probably just after right colic artery arises. A small calcification can be observed at SMA at the site of occlusion.
Pneumatosis, as well as diminished intestinal wall contrast enhancement in small bowel segments.
Venous gas can be seen at straight veins and anastomotic loops, best aprecciated in sagital reconstruction as linear gas filling defects.
Small amount of free fluid between bowel loops
In this case of acute SMA occlusion, differentiation of the underlying pathological cause is difficult but more likely to acute in situ thrombosis superimposed on atherosclerosis by the finding of small calcification at the occlusion site.