Fig. 2
From: Giant colonic diverticulum: radiographic and MDCT characteristics
A 55-year-old man with giant sigmoid diverticulum (GSD) associated with acute diverticulitis. Abdominal radiograph (a) shows a large, round, homogenous radiolucency in the right upper quadrant that is smoothly marginated (arrows). Axial (b and c), coronal (d), and sagittal (e) contrast-enhanced CT images through the upper abdomen show a predominantly gas-filled structure in the right upper abdomen, communicating with the sigmoid colon (S) and consistent with GSD. The sigmoid colon is located in the right side of the abdomen (anatomical variant). The arrow demonstrates the neck of the GSD, which connects the diverticular cavity with the adjacent sigmoid colon; this finding is essential for correct diagnosis. The thickened wall of the diverticulum and the surrounding mesentery infiltration denote acute diverticulitis