title: Power Doppler sonography of cervical lymph nodes in patients with head and neck cancer.
abstract: OBJECTIVE
  The purpose of this preliminary study was to evaluate the usefulness of power Doppler sonography in differentiating metastatic from nonmetastatic cervical lymph nodes in patients with cancer.
  
  
  METHODS
  Histologically proved metastatic (n = 71) and nonmetastatic (n = 220) lymph nodes were examined with power Doppler sonography in 77 patients with head and neck cancer. Power Doppler sonography was assessed for its ability to differentiate metastatic from nonmetastatic lymph nodes.
  
  
  RESULTS
  Power Doppler sonography showed characteristic features of parenchymal blood flow signal in 59 (83%) of the 71 metastatic lymph nodes. By contrast, only four (2%) of the 220 nonmetastatic nodes showed these power Doppler signals. In addition, power Doppler sonography showed high levels of sensitivity (83%) and specificity (98%) in depicting metastatic lymph nodes, which were superior to the values (66% sensitivity and 92% specificity) obtained by applying size criteria (transverse to longitudinal ratio). However, a combination of the two criteria (parenchymal color signal and transverse to longitudinal ratio) improved diagnostic accuracy to 92% sensitivity and 100% specificity.
  
  
  CONCLUSIONS
  Our preliminary findings suggest that the power Doppler criteria of no hilar flow, peripheral parenchymal nodal flow, and a transverse to longitudinal ratio of more than 0.65 together constitute a powerful tool for depicting metastatic lymph nodes in patients with cancer.
authors.affiliation: Department of Radiology and Cancer Biology, Nagasaki University School of Dentistry, Sakamoto, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Ariji
authors.forename: Y
authors.initials: Y
authors.lastname: Kimura
authors.forename: N
authors.initials: N
authors.lastname: Hayashi
authors.forename: T
authors.initials: T
authors.lastname: Onitsuka
authors.forename: K
authors.initials: K
authors.lastname: Yonetsu
authors.forename: K
authors.initials: K
authors.lastname: Hayashi
authors.forename: E
authors.initials: E
authors.lastname: Ariji
authors.forename: T
authors.initials: T
authors.lastname: Kobayashi
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
mesh_terms: D000328:Adult; D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000000981:diagnostic imaging* / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D006258:Head and Neck Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D008198:Lymph Nodes / Q000098:blood supply / Q000000981:diagnostic imaging* / Q000473:pathology; D008207:Lymphatic Metastasis / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D008833:Microcirculation / Q000502:physiology; D008875:Middle Aged; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed; D018608:Ultrasonography, Doppler