[Application value of shear wave elastography technique in qualitative and quantitative diagnosis of breast masses]

Objective: To explore the value of shear wave elastography(SWE)stiff rim sign and SWE stiff rim sign combined with BI-RADS classification in qualitative diagnosis and multiple SWE parameters in quantitative diagnosis of benign and malignant breast masses. Methods: One hundred and eighty-eight patients, 18-83 (44±14) years old, with 199 breast masses (maximum diameter, 0.4-5.0 (2.1±1.0) cm) by ultrasound were selected.Qualitative diagnosis was made by SWE stiff rim sign, and SWEmax, SWEmean, SWEmin, SWE1max, SWE2max, SWE3max, SWE1mean, SWE2mean, SWE3mean were obtained. The ROC of each quantitative parameter was drawn, then the AUC was calculated. Results: There were 75 malignant masses and 124 benign masses in 199 breast masses confirmed by pathology. Qualitative diagnosis of BI-RADS classification (χ(2)=155.181) and of SWE stiff rim sign (χ(2)=117.304)and quantitative diagnosis of SWEmax, SWEmean (t=6.869,6.305), SWE1max, SWE2max, SWE3max (t=8.768,9.059,9.180), SWE1mean, SWE2mean, SWE3mean (t=10.041,10.312,10.576) were all statistically significant (all P<0.01). But there was no statistically significance in quantitative diagnosis of SWEmin (P>0.05). The AUC value of qualitative diagnosis of SWE stiff rim sign combined with BI-RADS classification was 0.967, and the sensitivity was 92.0%.For BI-RADS 4a masses,the positive rate of puncture could be increased from 15.3% to 77.8% by combination of SWE hard ring sign. Conclusions: Qualitative diagnosis of SWE stiff rim sign and quantitative diagnosis of multiple SWE parameters are of high accuracy in differentiating benign or malignant breast masses. The combination of SWE stiff rim sign and BI-RADS classification could further improve the sensitivity of qualitative diagnosis, and increase the positive rate of puncture for 4a masses.