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Histopathological classification of epidural fibrosis (18).
| Grade 0 | No fibrosis affecting the dura mater |
|---|---|
| Grade 1 | Only a thin fibrous band between the scar tissue and dura |
| Grade 2 | Adhesion continues to progress but does not cover the entire laminectomy defect (less than 2/3) |
| Grade 3 | Scar tissue adhesion is larger, constituting more than 2/3 of the laminectomy defect and/or extending to the nerve root |
