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A Rare Case of Radiation-Induced Meningioma that Occurred Only 3 Years and 6 Months after Radiation Therapy for Oligodendroglioma Yukika ARAI 1 , Kazutaka SUMITA 1 , Kaoru TAMURA 1 , Daisuke KOBAYASHI 2 , Jun KARAKAMA 1 , Kei ITO 1 , Masae KUROHA 1 , Motoki INAJI 1 , Yoji TANAKA 1 , Tadashi NARIAI 1 , Taketoshi MAEHARA 1 1Department of Neurosurgery, Tokyo Medical and Dental University 2Department of Human Pathology, Tokyo Medical and Dental University Keyword: radiation-induced meningioma , glioma pp.515-521
Published Date 2018/6/10
DOI https://doi.org/10.11477/mf.1436203761
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 We describe an adult case of radiation-induced meningioma(RIM)that was identified within a short interval from the initial treatment for brain tumor. A 45-year-old woman, who had tumor resection followed by radiation therapy for right frontal oligodendroglioma, showed a small enhanced lesion on the right frontal region 3 years and 6 months after the initial radiation therapy. The pathological diagnosis was meningioma(World Health Organization(WHO)grade Ⅰ)and the Ki-67 labeling index was 3.2%. Most RIMs occur after a long period of time(18.7-24.0 years on average)following radiation therapy. Several studies have suggested that the period before the occurrence of RIM is correlated with both the age of a patient and the radiation dose at the time of radiation therapy. A patient that receives a higher dose of radiation at a younger age has a higher risk of RIM occurrence. In this case, the patient was middle aged;however, she was exposed to a high dose of radiation(54 Gy). High-dose radiation might induce the early onset of RIM. Recently, treatments for glioma have been developed, thus resulting in an increased long-term survival rate among patients. Physicians must pay attention not only to the recurrence of gliomas but also to the occurrence of RIMs.


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

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