title: Lipoma arborescens of the suprapatellar bursa and extensor digitorum longus tendon sheath: report of 2 cases.
abstract: OBJECTIVE
  Lipoma arborescens (diffuse articular lipomatosis) is a rare intra-articular lesion consisting of subsynovial villous proliferation of mature fat cells. The usual clinical presentation is painless swelling. The aim of this series was to emphasize the importance of gray scale and color Doppler sonography through the investigation of chronic joint swelling.
  
  
  METHODS
  Lipoma arborescens of the knee and extensor digitorum longus tendon sheath at the ankle region are described. The latter is extremely rare. We examined 2 patients with sonography before using cross-sectional modalities.
  
  
  RESULTS
  Gray scale sonography revealed hyperechoic irregular villous and frondlike projections within prominent joint effusion. A wavelike motion of the projections was shown by dynamic compression and manipulation of the effusion. We observed moderate vascularity on color Doppler sonography. Spectral analysis revealed a low-resistance arterial waveform.
  
  
  CONCLUSIONS
  Gray scale sonography is a useful diagnostic modality that can be performed to evaluate chronic joint swelling before the use of cross-sectional and more expensive modalities.
authors: Department of Radiology, Abant Izzet Baysal University, Izzet Baysal School of Medicine, 14280 Gölköy, Bolu, Turkey. eurger@yahoo.com
authors: Efsun
authors: E
authors: Senocak
authors: Kamil
authors: K
authors: Gurel
authors: Safiye
authors: S
authors: Gurel
authors: Kutay Engin
authors: KE
authors: Ozturan
authors: Husamettin
authors: H
authors: Cakici
authors: Fahri
authors: F
authors: Yilmaz
authors: Cetin
authors: C
authors: Boran
mesh_terms: D000293:Adolescent; D000368:Aged; D000843:Ankle Joint / Q000000981:diagnostic imaging* / Q000473:pathology; D002061:Bursa, Synovial / Q000000981:diagnostic imaging* / Q000473:pathology; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging* / Q000473:pathology; D008067:Lipoma / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D013710:Tendons / Q000000981:diagnostic imaging* / Q000473:pathology; D014057:Tomography, X-Ray Computed; D018615:Ultrasonography, Doppler, Color