Figure 3b. (a) Intraoperative photograph of a 19-year-old man who presented with gastrointestinal bleeding shows the serosal surface of a 4.0 x 2.5-cm Meckel diverticulum (M) located on the antimesenteric side of the ileum. (b) Intraoperative photograph of the serosal surface of the distal ileum in a 44-year-old woman with guaiac-positive stools and anemia shows a 1-cm diverticulum on the antimesenteric border.