Table 1. Comparison of SWE and SMI Parameters between Benign and Malignant Masses and Histologic Diagnoses according to BI-RADS.
| Parameters | Benign (n = 115) | Malignant (n = 85) | P |
|---|---|---|---|
| Size (mm) | 10.0 (7.0–14.0) | 13.0 (9.5–21.5) | < 0.001 |
| Emax (kPa)* | 21.30 (10.60–45.70) | 113.70 (47.25–138.70) | < 0.001 |
| Eratio* | 2.50 (1.45–4.72) | 9.71 (4.30–20.78) | < 0.001 |
| SMIVI (%)* | 2.10 (0.00–5.60) | 7.60 (4.15–12.30) | < 0.001 |
| BI-RADS† | |||
| Category 3 (55) | Benign breast tissue (24) | IDC (2) | NA |
| Duct ectasia (1) | |||
| Epidermoid cyst (1) | |||
| FA and fibroadenomatous hyperplasia (20) | |||
| Periductal inflammation (1) | |||
| Intraductal papilloma (2) | |||
| LCIS (1) | |||
| Lipoma (1) | |||
| Intramammary lymph node (1) | |||
| Sclerosing adenosis (1) | |||
| Category 4a (67) | FA and fibroadenomatous hyperplasia (25) | IDC (15) | NA |
| Benign breast tissue (13) | DCIS (7) | ||
| Granulomatous mastitis (1) | |||
| Intraductal papilloma (6) | |||
| Category 4b (34) | FA (4) | IDC (17) | NA |
| Benign breast tissue (7) | DCIS (5) | ||
| Apocrine metaplasia (1) | |||
| Category 4c (27) | FA (1) | IDC (18) | NA |
| Benign breast tissue (4) | DCIS (4) | ||
| Category 5 (17) | IDC (16) | NA | |
| DCIS (1) |
*Data are expressed as median (interquartile range), †Data are expressed as numbers. BI-RADS = breast imaging reporting and data system, DCIS = ductal carcinoma in situ, Emax = maximum elasticity, Eratio = elasticity ratio, FA = fibroadenoma, IDC = intraductal carcinoma, LCIS = lobular carcinoma in situ, NA = not applicable, SMI = superb microvascular imaging, SMIVI = vascular index in SMI, SWE = shear wave elastography