title: Lymph node hilus: gray scale and power Doppler sonography of cervical nodes.
abstract: OBJECTIVE
  To investigate the difference in the nodal hilus evaluated by gray scale and power Doppler sonography.
  
  
  METHODS
  One hundred ninety-two patients with proven cervical lymphadenopathy were included in the study (metastases, n = 118; tuberculosis, n = 56; and lymphoma, n = 18). Lymph nodes were evaluated by gray scale sonography for the echogenic hilus and power Doppler sonography for hilar vascularity.
  
  
  RESULTS
  Hilar vascularity was found even though the lymph node did not show an echogenic hilus on gray scale sonography (metastases, 59%; tuberculosis, 66%; and lymphoma, 91%).
  
  
  CONCLUSIONS
  Sonologists should be aware that gray scale and Doppler sonography show different aspects of the hilus, and the absence of the hilus on gray scale sonography does not necessarily imply an associated absence of hilar vascularity.
authors.affiliation: Department of Diagnostic Radiology and Organ Imaging, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, New Territories.
authors.forename: A
authors.initials: A
authors.lastname: Ahuja
authors.forename: M
authors.initials: M
authors.lastname: Ying
authors.forename: A
authors.initials: A
authors.lastname: King
authors.forename: H Y
authors.initials: HY
authors.lastname: Yuen
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000000981:diagnostic imaging / Q000556:secondary; D005260:Female; D006258:Head and Neck Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D008198:Lymph Nodes / Q000098:blood supply / Q000000981:diagnostic imaging* / Q000503:physiopathology; D008223:Lymphoma / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D009333:Neck; D014388:Tuberculosis, Lymph Node / Q000000981:diagnostic imaging; D018608:Ultrasonography, Doppler; D014655:Vascular Resistance