Figure 9a. Barium examination of the small intestine demonstrating Meckel diverticulum. (a) Image from a small bowel follow-through study in a 10-year-old girl with intermittent bloody stools and anemia shows a wide-mouthed Meckel diverticulum (arrow) on the antimesenteric border of the ileum. The tip of the diverticulum points away from the root of the small bowel mesentery. (b) Image from a small bowel follow-through study in an 11-year-old girl with abdominal pain and anemia shows an elongated Meckel diverticulum extending from the antimesenteric border of the distal ileum. The neck of the diverticulum is narrow (arrow). (Fig 9b courtesy of William M. Thompson, MD, Duke University, Durham, NC.)