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| Lesion severity score | Description |
| Grade 0 | no lesion |
| Grade 1 | appears superficial (only mucosa missing) |
| Grade 2 | deeper structures involved (greater depth than No. 1) |
| Grade 3 | multiple lesions and variable severity (1, 2 and/or 4) |
| Grade 4 | same as 2 and has an active appearance |
| Grade 5 | same as 4 plus active haemorrhage or adherent blood clot |
