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Fig. 3. —Acute diverticulitis of ascending colon in 27-year-old woman. Thin-section axial CT scan shows wall thickening of ascending colon (short black arrow) and terminal ileum (white arrow) with layered enhancement pattern clearly as inner hyperattenuating layer, middle layer of low attenuation, and outer hyperattenuating layer. There is inflamed diverticulum (long black arrow) that contains fecalith and peridiverticular infiltration.