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Two different phenotypes of cervical OPLL
| Item | Continuous/mixed | Segmental/localized |
|---|---|---|
| Upper cervical (C2, 3) involve | Frequent | Rare |
| Lower cervical (C5/6/7) involve | Sometimes | Frequent |
| Mean age | Younger | Older |
| Progression rate | Fast | Slow |
| Need for surgical treatment | Sometimes | Rare |
OPLL, ossification of the posterior longitudinal ligament.
