462rized cases that followed more than 2 years, desir-able results were obtained with a nidus obstruction rate of 25% in 1 year and 58% in 2 years and a nidus reduction rate of 91% in 2 years3). There were no neurological side effects. Furthermore, in a report on AVM, we investigated the relationship between stagnation time of the contrast medium in angiography and nidus occlusion rate. In this study, angiographs from 25 patients with AVM were analyzed. The results showed that an AVM with a longer stagnation time of the contrast medium was more likely to be occluded4). We also summarized Figure 4 Dose distribution of cerebral AVM and post-SRS images of angiographyFigure 5 SRS with non-invasive fixation with a mask systemthe most common cases of brain metastasis that were treated by radiosurgery5). At that time, since there was only one magnetic resonance imaging device in Juntendo University, the radiation effect of SRS was evaluated by CT images.SRS with non-invasive fixation of the head SRS with mask system started at 2009 while I was in the Japan Self-Defense Forces Central Hospital (Figure 5). Because of several trials, we started SRS with a non-invasive mask system with a mask system
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