title: Power Doppler sonography: evaluation of solid breast lesions and correlation with lymph node metastasis.
abstract: OBJECTIVE
  The purpose of this study was to assess the role of power Doppler US in differentiating benign from malignant solid breast masses when used in conjunction with grayscale sonography (US) and the relationship with axillary lymph node metastasis.
  
  
  METHODS
  Grayscale US of 353 solid lesions was categorized using the US BI-RADS final assessment system prospectively. On power Doppler US, the presence of identified or penetrating vessels within the mass was evaluated, respectively. Diagnostic accuracy was calculated at grayscale US with and without power Doppler US. Among malignant cases, tumor vascularity was correlated with lymph node involvement.
  
  
  RESULTS
  When the size of the masses was controlled, the identified or penetrating vessels were significantly more frequent in malignant lesions (P<.05). By using the identified and penetrating vessels in the mass as one of the diagnostic criteria for malignancy, the diagnostic accuracy was improved. In 54 infiltrating ductal carcinomas, although lymph node involvement was more frequently seen in the group having identified or penetrating vessels (40 and 35.3%) than in the avascular group (16.7 and 27%), it was not statistically significant (P>.05).
  
  
  CONCLUSIONS
  We suggest that identified or penetrating vessels within the mass on power Doppler US can be one of the malignant criteria.
authors.affiliation: Department of Radiology, Research Institute of Radiological Science, Yonsei University College of Medicine, Seoul 120-752, South Korea.
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Kwak
authors.forename: Eun-Kyung
authors.initials: EK
authors.lastname: Kim
authors.forename: Min Jung
authors.initials: MJ
authors.lastname: Kim
authors.forename: Seon Hyeong
authors.initials: SH
authors.lastname: Choi
authors.forename: Eunju
authors.initials: E
authors.lastname: Son
authors.forename: Ki Keun
authors.initials: KK
authors.lastname: Oh
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001941:Breast Diseases / Q000000981:diagnostic imaging / Q000473:pathology; D001943:Breast Neoplasms / Q000098:blood supply / Q000000981:diagnostic imaging* / Q000473:pathology; D018270:Carcinoma, Ductal, Breast / Q000000981:diagnostic imaging* / Q000556:secondary; D016009:Chi-Square Distribution; D003937:Diagnosis, Differential; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008198:Lymph Nodes / Q000473:pathology*; D008207:Lymphatic Metastasis; D008875:Middle Aged; D011336:Probability; D011379:Prognosis; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D018608:Ultrasonography, Doppler / Q000379:methods*; D016217:Ultrasonography, Mammary / Q000379:methods*