eng Science and Education Publishing American Journal of Medical Case Reports 2374-216X 2016-05-30 4 5 173 174 10.12691/ajmcr-4-5-8 AJMCR2016458 article Tension Pneumothorax as the Presentation of Pulmonary Langerhans Histiocytosis Conor McCartney cmccartn@slu.edu 1 Andrew Freeman 2 Ravi Nayak cmccartn@slu.edu 3 Department Internal Medicine, St. Louis University, United States Department of Pathology, DO Saint Louis University, United States Internal Medicine, Program Director Division of Pulmonary, Critical Care and Sleep Medicine, St. Louis University, United States A 36 year old male smoker presented to the emergency department with shortness of breath. A chest x-ray showed a tension pneumothorax. Chest tube was placed urgently. CT scan showed upper lobe predominant cystic lung lesions. Biopsy confirmed the diagnosis of pulmonary Langerhans Histiocytosis. http://pubs.sciepub.com/ajmcr/4/5/8/ajmcr-4-5-8.pdf tension pneumothorax pneumothorax langerhans histiocytosis lagerhans histiocytosis