^○Satoshi Fukumitsu¹, Yu Murakami¹, Koichiro Futatsuya¹, Hiromi Masaki¹, Yohei Takeshita¹, Toshihiko Hamamura¹, Kenta Anai¹, Junko Yamamoto², Yukunori Korogi¹ (1.Department of Radiology, University of Occupational and Environmental Health, JAPAN, 2.Department of Neurosurgery, University of Occupational and Environmental Health, JAPAN)

^○Kotaro Hosoi¹, Junji Moriya¹, Nozomu Shima¹, Yosuke Tsuchiya¹, Hayato Tomita¹, Shinji Wada¹, Kazuki Hashimoto¹, Yukihisa Ogawa¹, Shingo Hamaguchi², Kunihiro Yagihashi¹, Hidefumi Mimura¹ (1.Department of Radiology, St. Marianna University School of Medicine, Kawasaki, Kanagawa, Japan, 2.Kawasaki Municipal Tama Hospital, Kawasaki, Kanagawa, Japan)

^○Hidenari Hongyo¹, Hiroki Higashihara¹, Eiji Kashiwagi¹, Shinya Kosai¹, Keisuke Nagai¹, Kaisyu Tanaka¹, Yusuke Ono¹, Keigo Osuga², Noriyuki Tomiyama¹ (1.Department of Diagnostic and Interventional Radiology, Osaka University, Osaka, Japan, 2.Department of Radiology, Osaka Medical College, Osaka, Japan)