Fig. 2. Acute uncomplicated colonic diverticulitis in a 63-year-old man.

A. Ultrasonographic image through the long axis of the sigmoid colon reveals air-/fluid-containing diverticula (black arrows) with surrounding inflammatory infiltration, evidenced by the hyperechogenicity of the pericolic fat (asterisks). Notable mural thickening of the sigmoid colon is also evident, with a prominent, hypoechogenic muscularis propria (dashed, black arrows). B. A corresponding axial contrast-enhanced computed tomography image displays multiple diverticular outpouchings scattered along the sigmoid colon (open arrows), with mural thickening (asterisks) and stranding of the adjacent fat planes (white arrows).