title: Intra-articular synovial hemangioma; a rare cause of knee pain and swelling.
abstract: BACKGROUND
  Synovial hemangioma is a rare intra-articular benign tumor that is difficult to diagnose because of its nonspecific symptoms. Patients are generally children or young adults with a nontraumatic recurrent swollen painful knee.
  
  
  METHODS
  A 24-year-old woman presented with a 20-year history of recurrent pain and swelling in the right knee. Physical examination revealed a small painful point adjacent to the medial side of the patella. Magnetic resonance imaging revealed an intra-articular tumor. After arthroscopic examination, surgical excision was performed. The histology was characteristic of synovial hemangioma.
  
  
  RESULTS
  Open complete synovectomy of the circumscribed capillary hemangioma was successful, and the patient remains asymptomatic 2 years after surgery.
authors.affiliation: Department of Orthopedic Surgery, Saiseikai Nara Hospital, 4-643 Hachijo, Nara-shi, 6308145 Nara, Japan. okahashi@mub.biglobe.ne.jp
authors.forename: Kohjirou
authors.initials: K
authors.lastname: Okahashi
authors.forename: Kazuya
authors.initials: K
authors.lastname: Sugimoto
authors.forename: Makoto
authors.initials: M
authors.lastname: Iwai
authors.forename: Motonari
authors.initials: M
authors.lastname: Tanaka
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Fujisawa
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Takakura
mesh_terms: D000328:Adult; D018771:Arthralgia / Q000209:etiology; D001182:Arthroscopy; D005260:Female; D006391:Hemangioma / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D007719:Knee Joint; D013583:Synovial Membrane