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Histological grading criteria.
| Parameters | Score | Histological feature |
|---|---|---|
| Ulcer | 0 | None |
| 1 | Ulcer, <3 mm | |
| 2 | Ulcer, >3 mm | |
| Inflammation | 0 | None |
| 1 | Slight | |
| 2 | Severe | |
| Granuloma | 0 | None |
| 1 | Granuloma | |
| Extent | 0 | None |
| 1 | Mucosa | |
| 2 | Mucosa and submucosa | |
| 3 | Transmural | |
| Fibrosis | 0 | None |
| 1 | Slight | |
| 2 | Severe |
