title: The epidemiological findings and characteristic ground glass appearance on chest CT among patients with blunt lung injury.
abstract: OBJECTIVE
  To clarify the epidemiological findings and characteristics of ground glass lesions on chest computed tomography (CT) after blunt trauma.
  
  
  METHODS
  A medical college hospital and retrospective study.
  
  
  METHODS
  We retrospectively investigated all blunt chest trauma patients who were admitted from January 2004 to December 2010. The inclusion criteria were patients with: (1) chest CT examination on arrival, (2) intrathoracic traumatic lesions confirmed by initial CT, and (3) a second chest CT examination within 7 days from admission. We divided the subjects into two groups. A GG group included subjects who had ground glass lesions on initial chest CT and a control group included subjects who did not have the ground glass appearance.
  
  
  RESULTS
  The average age in the GG group was significantly lesser than that in the control group. The ratio of improvement for the value of SpO(2)/FiO(2) between on arrival and the second hospital day and ratio of improvement for CT findings between on arrival and the second CT examination in the GG group was greater than in the control group.
  
  
  CONCLUSIONS
  The ground glass appearance on chest CT after blunt trauma was not rare, and the patients with ground glass lesions were younger and tended to have a better improvement of oxygenation and CT images in comparison with the patients without these characteristic lesions.
authors.affiliation: Department of Traumatology and Critical Care Medicine, National Defense Medical College, 3-2 Namiki Tokorozawa Saitama, Japan.
authors.forename: Youichi
authors.initials: Y
authors.lastname: Yanagawa
authors.forename: Toshihisa
authors.initials: T
authors.lastname: Sakamoto