title: [Langerhans cell histiocytosis in children under one year].
abstract: BACKGROUND
  Langerhans cell histiocytosis is characterized by a clonal proliferation of activated Langerhans cells that infiltrate various organs of the body. Occurs at any age, from newborn until adulthood, with an incidence peak at 1-4 years.
  
  
  OBJECTIVE
  To describe the morphologyc characteristics of skin lesions and clinical course of 15 patients with Langerhans cell histiocytosis.
  
  
  METHODS
  A retrospective review of the medical records of patients with Langerhans cell histiocytosis from Ramos Mejia Hospital and Aleman Hospital, between 1999-2007.
  
  
  RESULTS
  Review of medical records from 15 patients, 6 females and 9 males. Skin lesions were congenital in 8 cases and appeared between 2-12 months of age in 7 cases. The patients with congenital presentation only had a cutaneous manifestation; one patient who developed a systemic compromise (lung, liver and spleen) is currently under treatment. Three patients with presentation after birth only had cutaneous lesions, the others had a systemic disease. One of this patients died during treatment. Histopathology showed a histiocytic infiltrate in the papillary dermis with epidermotrophism; inmunomarking with S100 and CD1a was positive.
  
  
  CONCLUSIONS
  Both clinical manifestation (congenital and after birth) represent different ends of a spectrum of the same condition, with the potencial to develop into disseminated Langerhans cell histiocytosis.
authors.affiliation: Hospital Alemán, Buenos Aires, Argentina.
authors.forename: Margarita
authors.initials: M
authors.lastname: Larralde
authors.forename: María E
authors.initials: ME
authors.lastname: Abad
authors.forename: Begoña
authors.initials: B
authors.lastname: Gomar
mesh_terms: D005260:Female; D006646:Histiocytosis, Langerhans-Cell / Q000175:diagnosis; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D012189:Retrospective Studies