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Fig. 1D. —26-year-old man with recently diagnosed Wegener's granulomatosis who developed abdominal pain and diarrhea. IV contrast-enhanced CT scans obtained several days after A and B show prominent wall thickening of duodenum (arrowheads, C), jejunum (straight arrows, D), and colon (curved arrows, D) with mucosal and serosal enhancement separated by low-attenuation mural edema. Extensive mesenteric inflammatory changes are present. Note rapid interval change between A and D, which were obtained at similar level.