title: [Traumatic lung cyst].
abstract: BACKGROUND
  Traumatic lung cysts have been reported to be comparatively rare. However, we diagnosed 11 cases to have traumatic lung cyst over the past 6 years. We mainly present the most characteristic 3 cases and also discuss our findings for the 11 cases of traumatic lung cyst. CASE 1: A 17-year-old male, who was injured on his left chest after falling from a height of 7 m. He presented in a state of shock and was immediately resected the left lung because of massive bleeding from a damage of pulmonary vein. However, he finally died due to disseminated intravascular clotting (DIC). We recognized a large traumatic lung cyst, which went from the upper lobe to lower lobe thoroughly the resected lung. CASE 2 : A 19-year-old male, who was injured on his left chest in traffic accident. We recognized a wide contusion, cysts and hemorrhage in the left upper lobe on computed tomography (CT) findings. We performed an emergency left upper lobectomy because of the intrabronchial bleeding. CASE 3: An 11-year-old boy, suffered trauma on his right chest when he fell while walking. We recognized minor redness and subcutaneous emphysema in the injured are, in addition to a contusion and cyst in the right lower lobe on CT findings. He was conservatively observed, and both the cyst and contusion gradually contracted.
  
  
  CONCLUSIONS
  Regarding traumatic lung cysts, a quick diagnosis and timely selection of the optimal treatment are important. When a pulmonary injury is serious, then quick surgical treatment is necessary, and a close follow-up is necessary in case undergoing conservative treatment.
authors.affiliation: Department of Thoracic Surgery, Kanto Rosai Hospital, Kawasaki, Japan.
authors.forename: Michihiko
authors.initials: M
authors.lastname: Tajiri
authors.forename: T
authors.initials: T
authors.lastname: Wu
authors.forename: T
authors.initials: T
authors.lastname: Yamagata
mesh_terms: D000063:Accidents, Traffic; D000293:Adolescent; D000328:Adult; D002648:Child; D003560:Cysts / Q000209:etiology*; D006801:Humans; D008171:Lung Diseases / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D013898:Thoracic Injuries / Q000150:complications*; D014949:Wounds, Nonpenetrating / Q000150:complications*