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| Simpson grade | New postoperative or worsened CN deficit | New deficit 6 months later | Improvement of previous deficit |
|---|---|---|---|
| I (0) | – | – | – |
| II (11) | 9 | 5 | 3 |
| III (7) | 2 | 1 | 0 |
| IV (4) | 1 | 0 | 1 |
| V (0) | – | – | – |
Abbreviation: CN, cranial nerve.
