Case of the Week
Section Editors: Matylda Machnowska1 and Anvita Pauranik2
1University of Toronto, Toronto, Ontario, Canada
2BC Children's Hospital, University of British Columbia, Vancouver, British Columbia, Canada
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October 27, 2008
Primary Extradural Meningioma
- Meningiomas arising in locations outside the dura are called ectopic, extradural (epidural), calvarial, cutaneous, extracranial, extraneuraxial, or intraosseous meningiomas.
- Extracranial meningiomas are rare; their reported incidence is 1%'2% of all meningiomas.
- Extradural meningiomas are classified as purely extracalvarial (type I), purely calvarial (type II), or calvarial with extracalvarial extension (type III).
- Consider in the differential diagnosis when a solitary lytic calvarial lesion is seen near the suture line or is associated with a prior skull injury.
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