title: [A spontaneously resolving T-cell lymphoma].
abstract: BACKGROUND
  Primary cutaneous CD30+ anaplastic large-cell lymphoma is a rare form of non-Hodgkin's lymphoma, which is restricted to the skin.
  
  
  METHODS
  A 50-year-old man presented with an asymptomatic tumorous area in the groin that had appeared within the previous week, and a longer history of a transient red, flaking area in the popliteal space. Histopathological findings were consistent with CD30+ anaplastic large-cell lymphoma. Staging demonstrated no extracutanous spread. The skin lesions disappeared without treatment within 3 months.
  
  
  CONCLUSIONS
  Primary cutaneous CD30+ anaplastic large-cell lymphoma is a rare condition. It has a histopathological picture of a diffuse proliferation of large atypical anaplastic cells, suggesting an unfavourable disease course. However, this condition is characterised by a indolent course and favourable prognosis since spontaneous complete regression can occur.
authors.affiliation: Universitair Medisch Centrum St Radboud, afd. Dermatologie, Nijmegen, the Netherlands. e.mutsaers@derma.umcn.nl
authors.forename: Elisabeth R
authors.initials: ER
authors.lastname: Mutsaers
authors.forename: Rein
authors.initials: R
authors.lastname: Willemze
authors.forename: Michelle M
authors.initials: MM
authors.lastname: van Rossum
mesh_terms: D000951:Antigens, Neoplasm / Q000032:analysis*; D006801:Humans; D017730:Ki-1 Antigen / Q000032:analysis*; D016410:Lymphoma, T-Cell, Cutaneous / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D012075:Remission, Spontaneous; D012878:Skin Neoplasms / Q000276:immunology*
chemical_list: D000951:Antigens, Neoplasm; D017730:Ki-1 Antigen