CT shows wall thickening of a 15cm segment of small bowel centrally within the abdomen. Non-enhancement of the superior mesenteric vein (but enhancement of the splenic and portal veins) and mild mesenteric fat stranding adjacent to the SMV. Appearance suggests SMV thrombus with ischemic segment of small bowel. Doppler ultrasound confirms near-completely occlusive thrombus within the SMV. No underlying cause was identified in this case.