title: Baker's cyst in pediatric patients: Ultrasonographic characteristics.
abstract: OBJECTIVE
  Evaluate incidence, etiology, and sonographic features of Baker's cyst in children.
  
  
  METHODS
  We examined 16 pediatric patients, with the clinical diagnosis of Baker's cyst. The possibility to confirm or to exclude the presence of the lesion, assess the structure, presence of bilateralism and joint effusion were considered. Three subjects had known juvenile arthritis, 2 hemophilia, 11 a popliteal swelling in the absence of concomitant diseases.
  
  
  RESULTS
  In all patients it was possible to confirm (11) or to exclude (5) the presence of Baker's cyst. The idiopathic forms (6) exhibited anechoic structure; in patients with arthritis (3) there was hypertrophic synovium; in hemophilic patients at the presentation (2) anechoic structure with layering (serum and red blood cells); in chronic hemophilia synovial hypertrophy was seen. Joint effusion was constantly present in children with hemophilia and arthritis and in 1 case of idiopathic cyst.
  
  
  CONCLUSIONS
  Baker's cysts in children are rare. Ultrasound is able to confirm or to exclude the presence of the lesion and it is able to evaluate characteristics, bilateralism and association with joint effusion.
authors: IRCCS Foundation, San Matteo Medical Center, Institute of Radiology, University of Pavia, Italy.
authors: S
authors: S
authors: Alessi
authors: R
authors: R
authors: Depaoli
authors: M
authors: M
authors: Canepari
authors: F
authors: F
authors: Bartolucci
authors: M
authors: M
authors: Zacchino
authors: F
authors: F
authors: Draghi
keywords: Arthritis; Baker’s cysts; Children; Juvenile arthritis; Sonography
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