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Rutgeerts Classification

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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