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Table 1 Zargar's grading classification of mucosal injury caused by ingestion of caustic substances

From: Caustic ingestion in adults: The role of endoscopic classification in predicting outcome

Grade 0 Normal examination
Grade 1 edema and hypermia of the mucosa
Grade 2a Superficial ulceration, erosions, friability, blisters, exudates, hemorrhages, whitish membranes
Grade 2b Grade 2a plus deep discrete or circumferential ulcerations
Grade 3a Small scattered areas of multiple ulceration and areas of necrosis with brown-black or greyish discoloration
Grade 3b Extensive necrosis