Figure 5. Enterocolic fistula. Spot radiograph obtained during air insufflation for air-contrast barium enema examination in a 58-year-old man shows unsuspected communication between sigmoid colon and small bowel (arrowheads). The patient had undergone successful surgical removal of an infected abdominal aortic graft 6 months earlier. Note also faint contrast agent (arrow) extending along aortic region.