Seen at the cardias. The retroflexed image, the endoscope is observed. Pathophysiology: Reflux esophagitis develops when gastric contents are passively regurgitated into the esophagus. Gastric acid, pepsin, and bile irritate the squamous epithelium, leading to erosion and ulceration of esophageal mucosa. Eventually, a columnar epithelial lining may develop. This lining is a premalignant condition termed Barrett Esophagus.
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