title: Power Doppler sonography of metastatic nodes from papillary carcinoma of the thyroid.
abstract: OBJECTIVE
  Metastatic nodes on power Doppler sonography tend to demonstrate high intranodal resistance and abnormal distribution of vascularity within a node. However, in our experience metastatic nodes from papillary carcinoma of the thyroid frequently demonstrate low intranodal resistance and some do not demonstrate the presence of any abnormal vascularity within. We were therefore interested to document these features.
  
  
  METHODS
  The grey scale and power Doppler sonograms of 21 metastatic nodes from papillary carcinoma of the thyroid were evaluated. The intranodal distribution of vessels and the intranodal vascular resistance of vessels was assessed and compared with the reported features of metastatic nodes from other head and neck primaries.
  
  
  RESULTS
  A majority (17/20, 85%) of metastatic nodes from papillary carcinoma of the thyroid had a maximum resistance index (RI) and pulsatility index (PI) < 0.8 and 1.6, respectively. A majority of the nodes (16/21, 76%) demonstrated abnormal capsular vascularity within the nodes.
  
  
  CONCLUSIONS
  Metastatic nodes from papillary carcinoma on power Doppler sonography frequently have low RI and PI and 24% demonstrate just prominent hilar vascularity similar to reactive nodes.
authors: Department of Diagnostic Radiology and Organ Imaging, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong. aniltahuja@cuhk.edu.hk
authors: A T
authors: AT
authors: Ahuja
authors: M
authors: M
authors: Ying
authors: H Y
authors: HY
authors: Yuen
authors: C
authors: C
authors: Metreweli
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002291:Carcinoma, Papillary / Q000000981:diagnostic imaging / Q000556:secondary*; D002648:Child; D005260:Female; D006801:Humans; D008198:Lymph Nodes / Q000098:blood supply / Q000000981:diagnostic imaging; D008207:Lymphatic Metastasis / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D009333:Neck; D011673:Pulsatile Flow; D012680:Sensitivity and Specificity; D013964:Thyroid Neoplasms; D018615:Ultrasonography, Doppler, Color; D014655:Vascular Resistance