View larger version (225K)

Figure 6a.   Colonic carcinoma with proximal ischemic colitis in a 72-year-old man. (a) Contrast-enhanced CT scan shows concentric bowel wall thickening in the ischemic sigmoid colon (open arrows) with an intervening normal-appearing segment separating the ischemic segment from the tumoral segment in the rectum (solid arrows). (b) Photograph of the resected specimen shows normal colonic mucosa between the tumoral segment (arrows) and ischemic segment (arrowheads).