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Fig. 4B. —43-year-old woman with Crohn's disease involving colon. Contrast-enhanced CT scans show bowel wall thickening (open arrows) of colon with loss of haustration. Note markedly prominent pericolic vasculature (solid arrows) highlighted by fibrofatty proliferation. Prominent pericolic vasculature is more clearly visualized in A, and bowel wall thickening is well depicted in B.