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Japanese

A Case of Intraosseous Meningioma with Extracranial Progression having Difficulty in Making a Preoperative Diagnosis Masataka NANTO 1 , Naoki TSUJI 2 , Junichiro MIKI 2 , Satoshi TANAKA 1 , Yuji UEMATSU 1 , Toru ITAKURA 1 1Department of Neurological Surgery,Wakayama Medical University 2Department of Neurological Surgery,Naga District Hospital Keyword: hyperostosis , intraosseous meningioma , parietal bone pp.51-56
Published Date 2005/1/1
DOI https://doi.org/10.11477/mf.1436100006
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Intraosseous meningioma is very rare and is often confused preoperatively with a primary bone tumor of the skull. We report a case of intraosseous meningioma with hyperostosis for which preoperative diagnosis was difficult. A 78-year-old female with a slowly growing hard mass in the left parietal bone was admitted. Neurological findings were normal. Plain skull radiograph showed a 6 × 6cm hyperostotic lesion in the left parietal bone. Bone window CT scan showed thickening and hyperostosis in the same area. MRI using Gd-DTPA showed heterogeneous enhancement of the intraosseous mass, and homogenous enhancement of the dura matter. And angiogram showed a tumor stain fed by the bilateral superficial temporal artery and the lt-occipital artery. The tumor and the underlying dura mater were totally removed. Preoperative diagnosis was an osteogenic tumor, but histological examination revealed a transitional meningioma. We discussed the development and the classification of an ectopic meningioma and the mechanism of hyperostosis. We should be aware of the existence of intraosseous menigiomas mimicking osteogenic tumors.


Copyright © 2005, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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