title: Vascularity and grey-scale sonographic features of normal cervical lymph nodes: variations with nodal size.
abstract: OBJECTIVE
  This study was undertaken to investigate variations in the vascularity and grey-scale sonographic features of cervical lymph nodes with their size.
  
  
  METHODS
  High resolution grey-scale sonography and power Doppler sonography were performed in 1133 cervical nodes in 109 volunteers who had a sonographic examination of the neck. Standardized parameters were used in power Doppler sonography.
  
  
  RESULTS
  About 90% of lymph nodes with a maximum transverse diameter greater than 5 mm showed vascularity and an echogenic hilus. Smaller nodes were less likely to show vascularity and an echogenic hilus. As the size of the lymph nodes increased, the intranodal blood flow velocity increased significantly (P < 0.05), whereas there was no significant variation in the vascular resistance(P> 0.05).
  
  
  CONCLUSIONS
  The findings provide a baseline for grey-scale and power Doppler sonography of normal cervical lymph nodes. Sonologists will find varying vascularity and grey-scale appearances when encountering nodes of different sizes.Ying, M.et al. (2001). Clinical Radiology, 56, 416-419.
authors.affiliation: Department of Optometry and Radiography, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong. ormying@polyu.edu.hk
authors.forename: M
authors.initials: M
authors.lastname: Ying
authors.forename: A
authors.initials: A
authors.lastname: Ahuja
authors.forename: F
authors.initials: F
authors.lastname: Brook
authors.forename: C
authors.initials: C
authors.lastname: Metreweli
mesh_terms: D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D001783:Blood Flow Velocity; D016009:Chi-Square Distribution; D005260:Female; D006801:Humans; D008198:Lymph Nodes / Q000098:blood supply / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D009333:Neck; D018615:Ultrasonography, Doppler, Color; D014655:Vascular Resistance