Macroscopic findings, result of histological examination, and duplicated ileum. (a) The macroscopic findings of the resected specimen. (b) The result of a histological examination of the duplication. The surface was covered with ileal mucosa and the duplication had muscle layers (H.E. stain × 100). (c)The duplicated ileum (white asterisk) shared the same muscle (arrow) as the adjacent ileum (black asterisk) (H.E. stain × 5).