Effectiveness of Quantitative Shear Wave Elastography for the Prediction of Axillary Lymph Node Metastasis

Table 2

Diagnostic performance of BUS and SWE for predicting axillary lymph node metastasis.

Variables	Cutoff values	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	Accuracy (%)
BUS		75.71	68.89	79.10	64.58	73.04
Emax	21.10	70.00	93.33	94.23	66.67	79.13
Emean	13.10	78.57	80.00	85.94	70.59	79.13
Emin	9.00	75.71	68.89	79.10	64.58	73.04
Emean-m	1.58	81.43	82.22	87.69	74.00	81.74
BUS + Emax	21.10	88.57	66.67	80.52	78.95	80.00
BUS + Emean	13.10	91.43	57.78	77.11	81.25	78.26
BUS + Emin	9.00	91.43	51.11	74.42	79.31	75.65
BUS + Emean-m	1.58	95.71	60.00	78.82	90.00	81.74

BUS, B-mode ultrasound category; SWE, shear wave elastography; PPV, positive predictive value; NPV, negative predictive value; E_max, maximal elasticity score of the lesion;, E_mean, mean elasticity score of the lesion; E_min, minimal elasticity score of the lesion; E_mean-m, ratio of E_mean mean of the lesions divided by E_mean of surrounding muscles; BUS + E_max, combined use of E_max and BUS; BUS + E_mean, combined use of E_mean and BUS; BUS + E_min, combined use of E_min and BUS; BUS + E_mean-m, combined use of E_mean-m and BUS.