Additional Assessment of Developed Occipital Sinus Using Intraoperative Indocyanine Green Videoangiography for a Safe Foramen Magnum Decompression—Technical Case Report. Issue 5 (15th October 2020) - Omoto, Koji; Takeshima, Yasuhiro; Nishimura, Fumihiko; Nakagawa, Ichiro; Motoyama, Yasushi; Park, Young-Su; Nakase, Hiroyuki