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Fig. 3 —67-year-old febrile man with acute diverticulitis who presented with left lower quadrant pain, leukocytosis, and known history of diverticulosis. Axial contrast-enhanced CT scan at level of distal descending colon shows abnormal infiltration of pericolonic fat and associated punctate gas collections (long arrow). Note abnormal thickening of colon wall (short arrow) adjacent to pericolonic inflammatory changes.