| Grade | Description |
|---|---|
| 0 | Normal villi |
| 1 | Subepithelial space top of villus |
| 2 | Extension of subepithelial space at top of villus with moderate separation of mucosa from lamina propria |
| 3 | Extensive subepithelial separation from the lamina propria down the sides of the villi, ulceration at the villous tips |
| 4 | Denuded villi |
| 5 | Disintegration of lamina propria |
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