Fig. 11

A 29-year-old female with ACE inhibitor-induced angioedema involving multiple small bowel loops. a The axial CE-CT shows oedematous thickening of the small bowel folds with mucosal enhancement (arrows). A moderate amount of intraperitoneal free fluid is noted in the pelvis (asterisk). b The coronal reformatted image demonstrates oedematous wall thickening of the proximal jejunum and intrapelvic small bowel. The proximal jejunum (large arrow) shows oedematous thickening of the jejunal folds. The short axis section of the involved intrapelvic small bowel shows the halo sign, representing a low-density submucosal layer with mucosal and subserosal enhancement (small arrows). Asterisks denote intraperitoneal free fluid. c Spot film of single-contrast small bowel barium study shows straight small bowel folds thickening (arrow) and a stack of coins appearance