Fig. 3. A 3.6-cm intra-abdominal abscess in a 29-year-old male patient with Crohn’s disease. Postcontrast-enhanced axial (A) and coronal (B) computed tomography images show an air-containing abscess (white arrows) in the right lower mesentery. The coronal image exhibits severe wall thickening of the right proximal colon and deformity of the ileocecal valve (black arrow). A small amount of fluid (white arrowhead) is noted in the right paracolic gutter, consistent with localized peritonitis due to active Crohn’s disease with penetrating disease.
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