title: Typical whirl sign in sigmoid volvulus.
authors.affiliation: Department of Emergency Medicine, Mackay Memorial Hospital, Taipei, Taiwan.
authors.forename: Wai-Zen
authors.initials: WZ
authors.lastname: Shaw
authors.affiliation: Department of Emergency Medicine, Zhongxing Branch, Taipei City Hospital, Taipei, Taiwan.
authors.forename: Chang-Feng
authors.initials: CF
authors.lastname: Huang
authors.affiliation: Department of Emergency Medicine, Zhongxing Branch, Taipei City Hospital, Taipei, Taiwan.
authors.forename: Tzu-Yao
authors.initials: TY
authors.lastname: Hung
authors.affiliation: Department of Emergency Medicine, Zhongxing Branch, Taipei City Hospital, Taipei, Taiwan.
authors.forename: Yu-Hang
authors.initials: YH
authors.lastname: Yeh
mesh_terms: D015746:Abdominal Pain / Q000209:etiology; D000368:Aged; D012809:Colon, Sigmoid; D003108:Colonic Diseases / Q000150:complications / Q000000981:diagnostic imaging*; D006801:Humans; D045822:Intestinal Volvulus / Q000150:complications / Q000000981:diagnostic imaging*; D008297:Male; D014057:Tomography, X-Ray Computed