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KMID : 0942820020010020153
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Journal of Korean Brain Tumor Society
2002 Volume.1 No. 2 p.153 ~ p.156
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Huge Ectopic Meningioma with Extracranial Extension
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Lee Seung-Joon
Kim Jae-Min
Cheong Jin-Hwan
Kim Choong-Hyun
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Abstract
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Ectopic meningioma is derived from presummed ectopic arachnoid cap cells in an extradural location and occurs in only 0.8-0.9% of all meningiomas. We report a very rare case of ectopic meningioma seemed to originate from the diploic space. A 46-year-old woman presented with a firm scalp mass on the left parietal region. Magnetic resonance images showed a huge heterogeneously enhancing mass both in the intracranial and in the extracranial portion. Intraoperative findings demonstrated the tumor mainly occupied the intradiploic space and through dural defect it expanded into both intracranial and extracranial space like a flying saucer. The tumor was excised subtotally and the pathological diagnosis was transitional meningioma. The postoperative clinical course was uneventful. With reviewing pertinent literatures, we enforce this case as intradiploic meningioma, which may be classified as a subgroup of primary intraosseous meningioma.
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KEYWORD
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Ectopic meningioma, Diploic space, Primary intraosseous meningioma
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