Circumferential thickening and enhancement of the distal 15-20 cm of small bowel with mild dilatation of the bowel proximal to this segment. The associated mesentery is congested. A small volume of free fluid is noted in the region but there is no collection or perforation. Several mildly enlarged nodes in the small bowel mesentery but no definite signs of proximal small bowel disease. Normal large bowel.