title: Pigmented villonodular synovitis: a retrospective single-center study of 122 cases and review of the literature.
abstract: OBJECTIVE
  Pigmented villonodular synovitis (PVNS) is a rare but disabling disease. The objective was to describe the clinical presentation and outcomes of PVNS according to its localization.
  
  
  METHODS
  Retrospective, systematic study of all cases of biopsy-proven PVNS followed in 1 tertiary-care center specialized in isotopic synoviorthesis. Cases were selected by keyword. Collected data included disease localization, therapeutic modalities, and outcomes.
  
  
  RESULTS
  A total of 122 cases (mean age 33.0 ± 13.1 years, 58% female, 89% diffuse form) of histologically confirmed PVNS were analyzed with a mean follow-up of 5.8 ± 4.3 years (707 patient-years total). The main localizations were the knee (75%) and ankle (16%). Clinical presentation included joint pain (80%) and joint effusion (79%) with hemarthrosis (75% of analyzed articular fluid). The mean delay before diagnosis was 2.9 ± 3.7 years. Magnetic resonance imaging was helpful for diagnosis in 83%. Surgical synovectomy was initially performed in 98% of cases and was often associated with isotopic synoviorthesis (knee: 57%; other localizations: 74%). In patients with a diffuse form treated at first line by surgery followed by isotopic synoviorthesis, the relapse rate was 30% (knee) and 9% (other localizations), respectively, with a mean delay before relapse of 2.6 ± 2.4 and 2.4 ± 0.9 years, respectively.
  
  
  CONCLUSIONS
  PVNS occurs in young adults, mainly in the knee joint; joint pain and effusion with hemarthrosis are the most frequent signs. Relapse is frequent, in particular, for diffuse knee PVNS; the usefulness of isotopic synoviorthesis remains to be confirmed.
authors.affiliation: Paris Descartes University, Medicine Faculty, APHP, Rheumatology B Department,Cochin Hospital, France.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Ottaviani
authors.forename: Xavier
authors.initials: X
authors.lastname: Ayral
authors.forename: Maxime
authors.initials: M
authors.lastname: Dougados
authors.forename: Laure
authors.initials: L
authors.lastname: Gossec
mesh_terms: D000328:Adult; D001175:Arthrography; D001706:Biopsy; D005260:Female; D006395:Hemarthrosis / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy; D006801:Humans; D006833:Hydrarthrosis / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy; D007270:Injections, Intra-Articular; D007596:Joints / Q000473:pathology* / Q000503:physiopathology; D008297:Male; D011868:Radioisotopes / Q000627:therapeutic use; D012008:Recurrence; D012189:Retrospective Studies; D000074402:Synovectomy; D013583:Synovial Membrane / Q000473:pathology; D013586:Synovitis, Pigmented Villonodular / Q000150:complications / Q000175:diagnosis* / Q000628:therapy; D016896:Treatment Outcome
chemical_list: D011868:Radioisotopes