title: Traumatic pulmonary pseudocysts after blunt chest trauma: Prevalence, mechanisms of injury, and computed tomography findings.
abstract: BACKGROUND
  Traumatic pulmonary pseudocyst (TPP) is a rare complication of blunt chest trauma and closely related with severe injury. However, it has been poorly documented. We present a retrospective review of TPP cases treated at our hospital.
  
  
  METHODS
  The medical records and chest computed tomography scans of patients with TPP treated from January 2010 to December 2013 were retrospectively studied.
  
  
  RESULTS
  A total of 978 patients underwent chest computed tomography for blunt chest trauma during the study period, and 81 (8.3%) had a total of 150 TPPs. The most common mechanism of injury was being struck by a motorized vehicle (n = 25, 30.9%). The mean (SD) Injury Severity Score (ISS) of the 81 patients was 33.2 (11.4). The prevalence of TPP was higher in younger patients (p = 0.011), but the total number of fractured ribs was significantly lower (p = 0.001). In a subgroup analysis performed according to pseudocyst location, the intraparenchymal group had more severe injuries than the subpleural group (ISS, 23.3 vs. 32.4, p < 0.001; chest Abbreviated Injury Scale [AIS] score, 3.4 vs. 4.0, p < 0.001; number of associated injuries, 2.9 vs. 4.0, p = 0.001). By multivariate analysis, ISS, age, and number of associated injuries were significantly different in these two groups (p = 0.038, p = 0.006, and p = 0.045, respectively).
  
  
  CONCLUSIONS
  The prevalence of TPP among cases of blunt chest trauma was 8.3% and was higher in those struck by a vehicle and younger patients. Intraparenchymal pseudocyst was found to be related to more severe injuries. TPP was a self-limiting condition that does not require specific treatment.
  
  
  METHODS
  Prognostic/epidemiologic study, level IV.
authors: From the Department of Thoracic and Cardiovascular Surgery (H.J.C.), Chungnam National University Hospital, Daejeon; and Department of Thoracic and Cardiovascular Surgery (Y.B.J., D.S.M.), and Department of Surgery, Trauma Center (J.N.L., M.C.), Gachon University Gil Medical Center, Incheon, Korea.
authors: Hyun Jin
authors: HJ
authors: Cho
authors: Yang Bin
authors: YB
authors: Jeon
authors: Dae Sung
authors: DS
authors: Ma
authors: Jung Nam
authors: JN
authors: Lee
authors: Min
authors: M
authors: Chung
mesh_terms: D015998:Abbreviated Injury Scale; D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D015601:Injury Severity Score; D055370:Lung Injury / Q000000981:diagnostic imaging* / Q000209:etiology* / Q000401:mortality; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012189:Retrospective Studies; D013898:Thoracic Injuries / Q000150:complications* / Q000000981:diagnostic imaging / Q000401:mortality; D014057:Tomography, X-Ray Computed; D014949:Wounds, Nonpenetrating / Q000150:complications* / Q000000981:diagnostic imaging / Q000401:mortality