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Fig. 7B —31-year-old man with segmental thickening of terminal ileum due to allergic angioedema. Coronal reformatted image better shows segmental area (30 cm) of thickening of terminal and distal ileum (arrows). Pattern of thickening suggests a submucosal process. In light of submucosal appearance, differential diagnosis includes vasculitis, angioedema, and infection.