title: Castleman's disease presented as a retroperitoneal mass.
abstract: OBJECTIVE
  We report one case of Castleman's disease and review published literature.
  
  
  METHODS
  We report the case of a 58 year old man who was referred to our institution because of lumbar pain. A computed tomography scan revealed a retroperitoneal mass. Open surgical exploration and excision were carried out. Finally pathological examination addressed the diagnosis.
  
  
  RESULTS
  Pathological examination demonstrated findings characteristic of unicentric hyaline vascular type of Castleman's disease. After surgical excision and 12 months follow-up there is no evidence of recurrence disease.
  
  
  CONCLUSIONS
  Castleman's disease is a rare lymphoproliferative disorder of uncertain etiology. Retroperitoneal localization is exceptional.
authors.affiliation: Service of Urology, Hospital Universitario 12 Octubre, Madrid, Spain. cabdoc@hotmail.com
authors.forename: Fernando
authors.initials: F
authors.lastname: Cabrera
authors.forename: Felipe
authors.initials: F
authors.lastname: Villacampa
authors.forename: Gemma
authors.initials: G
authors.lastname: Duque
authors.forename: Oscar
authors.initials: O
authors.lastname: Leiva
mesh_terms: D005871:Castleman Disease / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D012187:Retroperitoneal Space / Q000473:pathology; D014057:Tomography, X-Ray Computed