Figure 6a. Gastrocolic fistulas. (a) Frontal radiograph from solid-column barium enema examination in a 57-year-old man shows fistulous communication between the transverse colon and stomach via a large benign gastric ulcer (*) extending into the gastrocolic ligament. Note smooth folds radiating from the ulcer crater and absence of a gastric or colonic mass. (b) Contiguous transverse contrast-enhanced CT scans in a 59-year-old woman with abdominal pain and vomiting show pericolonic inflammatory changes surrounding a large transverse colonic diverticulum (arrows) in the gastrocolic region. The process blends imperceptibly with thickened gastric antrum (arrowheads). (c) Image from contrast-enhanced enema examination in the same patient as in b shows gastrocolic fistula (arrowhead), which proved to be secondary to diverticulitis at surgery and pathologic examination.