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Endoscopic classification of caustic injuries
| Grade | Features |
| Grade 0 | Normal |
| Grade 1 | Superficial mucosal edema and erythema |
| Grade 2 | Mucosal and submucosal ulcerations |
| Grade 2A | Superficial ulcerations, erosions, exudates |
| Grade 2B | Deep discrete or circumferential ulcerations |
| Grade 3 | Transmural ulcerations with necrosis |
| Grade 3A | Focal necrosis |
| Grade 3B | Extensive necrosis |
| Grade 4 | Perforations |
Reproduced from Zargar et al[14].
