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

Table 4

Correlation of Emean-m and histopathologic factors in metastatic LN of invasive breast cancer.

Variables	No. of metastatic LN^#		Ratio of metastatic LN/dissected LN^#		L/S^#		Extranodal extension
	Coefficient	value	Coefficient	value	Coefficient	value	Without extension	With extension	value
Emax	0.0657	0.6573	0.0662	0.6550	−0.1238	0.1876	24.01 ± 8.46	44.35 ± 6.06	<0.0001
Emean	0.2037	0.1650	0.1350	0.3602	−0.0392	0.6772	15.71 ± 6.21	28.42 ± 8.81	<0.0001
Emin	0.0970	0.5120	0.2136	0.1449	0.0237	0.8018	10.01 ± 3.61	16.59 ± 5.41	<0.0001
Emean-m	0.1574	0.2852	0.1159	0.4328	−0.0082	0.9309	1.70 ± 0.41	2.71 ± 0.67	<0.0001

SWE, shear wave elastography; EI, elasticity indices; LN, lymph node; E_max, maximal elasticity score of the lesion; E_mean, mean elasticity score of the lesion; E_mi, minimal elasticity score of the lesion; E_mean-m, ratio of E_mean mean of the lesions divided by E_mean of surrounding muscles. ^#Spearman correlation coefficient. Student's t test.