Savary-Miller classification of reflux esophagitis. Grades 1, 2, 3, 4 and 5.
Grade 1: single erosion above gastro-esophageal mucosal junction.
Grade 2: multiple, non-circumferential erosions above gastro-esophageal mucosal junction.
Grade 3: circumferential erosion above mucosal junction.
Grade 4: chronic change with esophageal ulceration and associated stricture.
Grade 5: Barrett's esophagus with histologically confirmed intestinal differentiation within columnar epithelium.
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