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Primary extradural meningioma classification by Lang et al. 2000 [3]
| Type | Description | Subtype |
|---|---|---|
| I | Purely extracalvarial with no bony attachment | |
| II | Purely calvarial | B (skull base) |
| C (convexity) | ||
| III | Calvarial with extracalvarial extension | B (skull base) |
| C (convexity) |
