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Fig. 3B. —60-year-old man with diverticulitis, fever, and left lower quadrant pain. Imaging used scan protocol V. CT scans show mural thickening of sigmoid colon associated with diverticula, inflammatory changes, and gas bubbles (arrow, B) in subperitoneal fat of sigmoid mesocolon. Rectal contrast material can help in determining degree of mural thickening but is unnecessary for diagnosis.