title: [Clinical features of adult pulmonary Langerhans' cell histiocytosis].
abstract: OBJECTIVE
  To investigate the clinical features including history, radiology, pulmonary function and histological pathology of adult pulmonary Langerhans' cell histiocytosis (PLCH).
  
  
  METHODS
  Clinical data of 5 PLCH patients were reviewed from June 2006 to October 2007.
  
  
  RESULTS
  All 5 patients were smokers with lung involvements. Spontaneous pneumothorax was the initial manifestation in 2 patients. One end-stage patient presented with severe pulmonary arterial hypertension. High-resolution CT scans of the lungs showed multifocal nodules and cysts that predominantly affected the upper and middle lung zones. At microscopic analysis, lung specimen showed discrete bronchiolocentric stellate lesions separated by uninvolved lung with air-space enlargement. Langerhans' cells expressed cell surface CD1a and cytoplasmic S-100 protein. Cessation of smoking led to stabilization of the disease. The decrease of V50 (53.6%-77.6% pred) and V25 (38.5%-70.5% pred) was consistent with small airway damages of lung histology.
  
  
  CONCLUSIONS
  PLCH is an isolated form of Langerhans' cell histiocytosis that primarily affects a single-system in smokers.
authors.affiliation: Beijing Institute of Respiratory Medicine, Department of Respirology Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China.
authors.forename: Qiao
authors.initials: Q
authors.lastname: Ye
authors.forename: Hua-Ping
authors.initials: HP
authors.lastname: Dai
authors.forename: Xue
authors.initials: X
authors.lastname: Li
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Chen
authors.initials: C
authors.lastname: Wang
mesh_terms: D000328:Adult; D006646:Histiocytosis, Langerhans-Cell / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D012907:Smoking; D055815:Young Adult