Intestinal metaplasia in Barrett's esophagusPhotograph demonstrating the four pit patterns that can be identified using acetic acid and enhanced magnification endoscopy to identify specialized intestinal metaplasia in Barrett's Esophagus. A, Pit pattern 1 demonstrating regular dots, B, Pit pattern 2 demonstrating reticular pits, C, Pit pattern 3 demonstrating villous features with no pits, D, Pit pattern 4 demonstrating ridged villous features. (Adapted from Guelrud M, Herrera I, Essenfeld H et al. Gastrointestinal Endoscopy 53(6):559-65, 2001; with permission.)
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