Left: View of esophageal wall through a side-viewing instrument. Island of columnar epithelium found in the distal esophagus of a 50 year-old woman undergoing ERCP.
Center: Island of columnar epithelium above the columnar segment of Barrett's disease in a 71 year-old man with chronic gastroesophageal reflux symptoms.
Right: Thickened, thread-like residual squamous epithelium within the columnar area of short-segment Barrett's disease in an 18 year-old man with gastroesophageal reflux symptoms.
Left: Tiny island of squamous epithelium within "short segment" Barrett's disease in a 43 year-old woman with a several-year history of gastroesophageal reflux symptoms. Right: Islands of squamous epithelium within the segment of Barrett's in a 64 year-old woman.
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