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Fig. 7A. —56-year-old man with obstructive colitis proximal to colonic carcinoma. Axial CT scan shows concentric wall thickening (long arrows) with preservation of layered enhancement pattern in ascending colon. Note diverticulum with thickened wall (short arrow), which was interpreted as inflamed diverticulum by both observers. However, diverticulum is not accompanied by peridiverticular inflammation.