^○Kensuke Uotani¹, Akihiro Hamanaka¹, Mai Mabuchi¹, Takuya Takahashi¹, Takaaki Matsunaga¹, Yuko Yamasaki¹, Takeyuki Kushima¹, Mitsuhiro Nishijima², Eri Kubota³, Hirofumi Tokai³ (1.Department of Radiology, Hyogo Prefectural Awaji Medical Center, Sumoto, Japan, 2.Department of Obstetrics and Gynecology, Hyogo Prefectural Awaji Medical Center, Sumoto, Japan, 3.Department of Anesthesiology, Hyogo Prefectural Awaji Medical Center, Sumoto, Japan)

^○Ken Oba, Minoru Yabuta, Rikako Wakai, Kengo Ikejima, Akiko Ota, Takahiro Sato, Daisuke Yamada, Ryo Miyazawa, Tomoya Nishiyama, Yasuyuki Kurihara (St. Luke's International Hospital)

^○Hiroyuki Tokue¹, Takashi Kameda², Masaya Miyazaki¹, Kei Shibuya¹, Souma Kumasaka¹, Masashi Ebara¹, Yumi Maehara¹, Terutaka Yoshihara¹, Takahito Nakajima¹, Azusa Tokue¹, Yoshito Tsushima¹, Hisao Yajima³, Makoto Aoki³ (1.Department of Diagnostic and Interventional Radiology, Gunma University Hospital, Gunma, Japan, 2.Department of Obstetrics and Gynecology, Gunma University Hospital, Gunma, Japan, 3.Emergency Medical Center Gunma University Hospital, Gunma, Japan)

^○Shintaro Nawata, Hiroyuki Kamide, Soichiro Kaki, Ryo Aoki, To Yamamoto, Zenjiro Sekikawa (Department of Diagnostic Radiology, Yokohama City University Medical Center, Yokohama, Japan)

^○Yukitoshi Toyoda¹, Satomi Seno¹, Shintaro Furugori¹, Tomohiko Orita¹, Tomohiro Funabiki¹, Yukio Inoue², Kozo Sato² (1.Department of Emergency and Critical Care Medicine, 2.済生会横浜市東部病院　放射線診断科)

^○Kurihara Yutaro¹, Reiko Woodhams², Keiji Matsunaga², Kaoru Fujii², Toshimasa Hara², Kohei Mitsui², Yusuke Inoue² (1.Department of Emergency and Critical Care Medicine, Kitasato University School of Medicine, Kanagawa, Japan, 2.Department of Diagnostic Radiology Kitasato University of School of Medicine, Kanagawa, Japan)