Thrombosis of superior mesenteric vein and several smaller branches. Nonocclusive thrombus in the main portal vein.
Mesenteric congestion. Small ascites.
Dilated proximal small bowel, which transitions into a segment of hypoenhancing, thick-walled small bowel in the lower abdomen. Following this segment distally, there is gradual return of enhancement starting with the mucosa, and gradual resolution of submucosal edema.