Unusual Case of Radiation-Induced Cavernous Malformation after Gamma Knife Radiosurgery for Meningioma |
Chang Ki Jang, Minsoo Kim, Na Young Jung, Young Goo Kim, Won Seok Chang, Hyun Ho Jung, Jin Woo Chang, Yong Gou Park |
Department of Neurosurgery, Yonsei Gamma Knife Center, Yonsei University College of Medicine, Seoul, Korea |
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Abstract |
We report an unusual case of delayed bleeding, highly suspected to be a radiation-induced cavernous malformation after gamma knife radiosurgery for meningioma. A 59-year-old woman underwent gamma knife radiosurgery with a marginal dose of 15 Gy with the 50% isodose line for parasagittal meningioma. After 5 years, magnetic resonance imaging (MRI) showed a marked decrease in the volume of the meningioma. The patient gradually developed right side weakness 7 years after the gamma knife radiosurgery. We performed another MRI scan and it showed a new hemorrhage compatible with cavernous malformation at the site of irradiation. Her weakness was conservatively treated and improved after about a month. |
Key Words:
Radiation-induced cavernous malformation, Gamma knife radiosurgery, Meningioma, MRI. |
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