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Histological colitis score.
| Inflammatory cells infiltration | Crypt injury | Epithelia damage | Score |
|---|---|---|---|
| None | Normal | None | 0 |
| Mild | Basal1/3damage | Mucosa | 1 |
| Moderate | Basal 2/3damage | Submucosa | 2 |
| Severe | Crypt lost, surface epithelium present | Transmural | 3 |
| Extremely severe | Crypt and surface epithelium lost | 4 |
