title: Crowned dens syndrome.
authors: Department of Emergency and Critical Care Medicine, Hitachi General Hospital, 2-1-1, Jonancho, Hitachi, Ibaraki 317-0077, Japan; Department of Emergency and Critical Care Medicine, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan; Department of Emergency and Critical Care Medicine, JR General Hospital, 2-1-3 Yoyogi, Sibuya-ku, Tokyo 151-8528, Japan.
authors: Ryota
authors: R
authors: Inokuchi
authors: Department of Emergency and Critical Care Medicine, Hitachi General Hospital, 2-1-1, Jonancho, Hitachi, Ibaraki 317-0077, Japan; Department of Emergency and Critical Care Medicine, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
authors: Kazuma
authors: K
authors: Ohshima
authors: Department of Emergency and Critical Care Medicine, Hitachi General Hospital, 2-1-1, Jonancho, Hitachi, Ibaraki 317-0077, Japan; Department of Emergency and Critical Care Medicine, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
authors: Miyuki
authors: M
authors: Yamamoto
authors: Department of Emergency and Critical Care Medicine, Hitachi General Hospital, 2-1-1, Jonancho, Hitachi, Ibaraki 317-0077, Japan; Department of Emergency and Critical Care Medicine, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
authors: Tatsuma
authors: T
authors: Fukuda
authors: Department of Emergency and Critical Care Medicine, Hitachi General Hospital, 2-1-1, Jonancho, Hitachi, Ibaraki 317-0077, Japan; Department of Emergency and Critical Care Medicine, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
authors: Kensuke
authors: K
authors: Nakamura