title: Pulmonary air crescent sign.
authors.affiliation: Division of Pulmonary Medicine, Department of Internal Medicine, Taipei Medical University Hospital, Taipei, Taiwan.
authors.forename: Kai-Ling
authors.initials: KL
authors.lastname: Lee
authors.affiliation: Division of General Surgery, Department of Surgery, Taipei Medical University Hospital, Taipei, Taiwan3Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.
authors.forename: Hung-Hua
authors.initials: HH
authors.lastname: Liang
authors.affiliation: Division of Pulmonary Medicine, Department of Internal Medicine, Taipei Medical University Hospital, Taipei, Taiwan.
authors.forename: Chi-Li
authors.initials: CL
authors.lastname: Chung
authors.affiliation: Division of Pulmonary Medicine, Department of Internal Medicine, Taipei Medical University Hospital, Taipei, Taiwan.
authors.forename: Shi-Hsin
authors.initials: SH
authors.lastname: Hsiao
authors.affiliation: Division of Pulmonary Medicine, Department of Internal Medicine, Taipei Medical University Hospital, Taipei, Taiwan.
authors.forename: Chung-Hung
authors.initials: CH
authors.lastname: Shih
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000175:diagnosis*; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged