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Rydell classification.
| Grade 0 | Epidural scar tissue was not adherent to the dura mater |
| Grade 1 | Epidural scar tissue was adherent to the dura mater but easily dissected |
| Grade 2 | Epidural scar tissue was adherent to the dura mater and difficultly dissected without disrupting the dura matter |
| Grade 3 | Epidural scar tissue was firmly adherent to the dura mater and could not be dissected |
