Severe short segment terminal ileitis leads into the ileocecal valve with wall thickening/irregularity and mucosal hyperenhancement with surrounding mesenteric edema. Minor upstream dilation without obstruction. Some branching inflammatory tracts extend along the posterior aspect suggesting entero-enteric or blind-ending fistulae involving the terminal ileum. No abscess. Inflammation with at least some degree of narrowing of the right ureter at this level resulting in mild upstream hydroureteronephrosis.