title: Langerhans' cell histiocytosis: paediatric head and neck study.
abstract: OBJECTIVE
  This study presents the experience of the Montreal Children's Hospital (MCH) with Langerhans' cell histiocytosis (LCH) and reviews the new advances in diagnosis and therapy of this disorder.
  
  
  METHODS
  Retrospective study of 20 patients seen between July 1986 and July 1997 diagnosed with LCH.
  
  
  METHODS
  All of the 20 charts were examined for variables including age, sex, area involved, treatment modalities, and complications.
  
  
  RESULTS
  Sixty-five percent of patients presented with localized lesions and 35% with multisystem involvement. The most common involved area was the skull, and 57% of skull lesions involved frontal bone. The temporal bone was involved in 25% of cases. The most common ear symptom was otorrhea.
  
  
  CONCLUSIONS
  Langerhans' cell histiocytosis is a rare paediatric disorder. Head and neck involvement occurs frequently in both localized and multisystem disease. The prognosis is highly dependent on the age and number of systems involved.
authors.affiliation: Department of Otolaryngology, McGill University, Montreal, Quebec.
authors.forename: A Y
authors.initials: AY
authors.lastname: al-Ammar
authors.forename: T L
authors.initials: TL
authors.lastname: Tewfik
authors.forename: M
authors.initials: M
authors.lastname: Bond
authors.forename: M D
authors.initials: MD
authors.lastname: Schloss
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006257:Head; D006646:Histiocytosis, Langerhans-Cell / Q000145:classification / Q000150:complications / Q000175:diagnosis* / Q000628:therapy*; D006801:Humans; D007223:Infant; D008297:Male; D009333:Neck; D012189:Retrospective Studies