| Grade | Description |
|---|---|
| 0 | No lesions in the distal ileum. |
| 1 | ≤ 5 aphthous lesions. |
| 2 | > 5 aphthous lesions with normal mucosa between lesions, or larger lesions confined to the ileocolonic anastomosis. |
| 3 | Diffuse aphthous ileitis with diffusely inflamed mucosa. |
| 4 | Diffuse inflammation with large ulcers, nodules, and/or strictures. |
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