Figure 4. Two examples of diverticular disease of the sigmoid and its complications. (a) Marked soft tissue thickening of the sigmoid within which there are diverticula. At this stage much of the change is likely to be collagenous. (b) Low attenuation element indicates a more fluid component due to a pericolic abscess. Note in both examples the prominent vascularity around the lesion and the changes in the pericolic fat.

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