Normal Colon and Ileum
Left: Anorectal junction, seen at retroflexion.
Right: Three semilunar folds, the "valves of Houston".
Left: Normal vascular pattern.
Center: Typical triangular folds characteristic of the transverse colon.
Right: Hepatic flexure of the colon, showing the bluish indentation on the colonic lumen made by the adjacent liver.
Left: Tip of the cecum.
Center: Opening of ileocecal valve is seen tangentially at left; orifice of appendix is visible just to right of center.
Right: Normal terminal ileum as seen after passing the colonoscope through the ileocecal valve.
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