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Malignant Transformation of Benign Meningiomas with or without Radiotherapy Satoshi NAKASU 1 1Division of Neurosurgery, Omi Medical Center Keyword: 髄膜腫 , 放射線治療 , 悪性化 , meningioma , radiotherapy , malignant transformation pp.839-845
Published Date 2024/7/10
DOI https://doi.org/10.11477/mf.1436204982
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 Most meningiomas are benign, slow growing tumors, which rarely progress to a higher grade. The incidence rate of malignant progression is estimated to be 2.98/1000 patient-year. However, non-skull base location is a significant risk factor for progression. The median time to malignant progression is 4.3 years; however, the cumulative rate of progression approaches a plateau after 10 years. Although radiosurgery does not appear to increase the incidence rate(0.5/1000 patient-year), exact comparisons have been difficult because of differences in study populations. The median time to progression is 7.0 years from initial diagnosis and 5.0 years from radiosurgery. The cumulative rate appears to increase even after 10 years. The risk of malignant transformation after radiotherapy may increase in patients with tumor-prone syndromes, with some controversies regarding patients with neurofibromatosis type 2. Although short term follow-up in patients with meningioma suggests that radiosurgery is safe, there is uncertainty regarding its use in pediatric patients, and those with tumor-prone syndromes.


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

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