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Endoscopic grading of the caustic gastrointestinal injury. (A) Grade 1 indicates only slight swelling and redness of the mucosa. (B) Grade 2A indicates the presence of superficial ulcers, bleeding, and exudates. (C) Grade 2B indicates local or encircling deep ulceration. (D) Grade 3A indicates focal necrosis. White arrows indicate focal necrosis. (E) Grade 3B indicates extensive necrosis.
