Yoshiki Hanaoka1, Jun-ichi Koyama2, Toshihiro Ogiwara1, Yoshinari Miyaoka1, Yu Fujii1, Takuya Nakamura1, Tetsuyoshi Horiuchi1, Kazuhiro Hongo1
1Department of Neurosurgery, Shinshu University Hospital, Matsumoto, Japan
2Neurointervention Center, Shinshu University Hospital, Matsumoto, Japan