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Fig. 23A. —Benign versus malignant colonic lesion: importance of lymphadenopathy. Contrast-enhanced axial CT scan of descending colon in 43-year-old man shows mild bowel wall thickening (straight arrow) with fluid in adjacent paracolic gutter (arrowhead). Small diverticulum is present (curved arrow). Findings are consistent with mild focal diverticulitis, which resolved after antibiotic therapy.