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Table 2 Primary extradural meningioma classification by Lang et al. 2000 [3]

From: Primary intraosseous osteolytic meningioma: a case report and review of the literature

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)