title: [Purely cutaneous Rosai-Dorfman disease present for 19 years].
abstract: BACKGROUND
  Rosai-Dorfman disease is a non-Langerhans histiocytosis chiefly affecting lymph nodes sites. In rare cases, it presents in the form of isolated skin lesions, without adenopathy, in which case it is a benign disease that regresses spontaneously within our number of months and years.
  
  
  METHODS
  An 83 year-old man presented with multiple red-brown nodular lesions on the upper part of the body that had been progressing over a period of 19 years. Histological examination showed infiltrate characteristic of Rosai-Dorfman disease, with numerous dermal foci of histiocytes expressing protein S100 but not expressing CD1a on immunohistochemical analysis, as well as emperipolesis. The lymph nodes sites were unaffected, and the remainder of the clinical and laboratory examinations were normal, indicating a purely cutaneous form of the disease. Treatment with isotretinoin was ineffective and the lesions continued to spread gradually, being treated from time to time with CO2 laser or cryotherapy.
  
  
  CONCLUSIONS
  Our case is atypical in terms of clinical presentation since it involved diffuse nodular lesions. The disease course was also unusual in that no spontaneous regression was observed even after 19 years.
authors.affiliation: Service de Dermatologie, CHU de Caen.
authors.forename: A-L
authors.initials: AL
authors.lastname: Laplaud
authors.forename: D
authors.initials: D
authors.lastname: Leroy
authors.forename: F
authors.initials: F
authors.lastname: Comoz
authors.forename: A
authors.initials: A
authors.lastname: Morice
authors.forename: M
authors.initials: M
authors.lastname: Paciencia
authors.forename: C
authors.initials: C
authors.lastname: Allabert
authors.forename: M
authors.initials: M
authors.lastname: Vuillamie
authors.forename: A
authors.initials: A
authors.lastname: Dompmartin
mesh_terms: D000369:Aged, 80 and over; D002465:Cell Movement; D003593:Cytoplasm / Q000648:ultrastructure; D006644:Histiocytes / Q000473:pathology; D015618:Histiocytosis, Sinus / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D008214:Lymphocytes / Q000473:pathology; D008297:Male; D009418:S100 Proteins / Q000032:analysis; D017444:Skin Diseases, Papulosquamous / Q000175:diagnosis* / Q000473:pathology
chemical_list: D009418:S100 Proteins