Table 5.
Distribution of T2‐Weighted Imaging, BI‐RADS DCE‐MRI and Qualitative and Quantitative DWI Variables for Benign and Malignant Tumors
| Total | Benign (n = 74) | Malignant (n = 136) | P‐value |
|---|---|---|---|
| Lesion laterality | 0.0086 | ||
| right | 45 (21.7) | 58 (27.5) | |
| left | 29 (13.5) | 78 (37.2) | |
| Lesion size | <.0001 | ||
| mean (SD) | 21.4 (20.36) | 30.6 (23.95) | |
| median(min‐max) | 15.0 (6‐100) | 30.6 (2‐100) | |
| Mass shape | <0.0001 | ||
| oval | 17(9.4) | 14(7.8) | |
| round | 40(22.2) | 21(11.7) | |
| irregular | 8(4.4) | 80(44.4) | |
| Mass margin | <0.0001 | ||
| circumscribed | 54(30.2) | 8(4.5) | |
| irregular | 6(3.4) | 57(31.8) | |
| spiculated | 4(2.2) | 50(27.9) | |
| Mass internal enhancement characteristics | <0.0001 | ||
| homogenous | 29(16.1) | 18(10.0) | |
| heterogeneous | 18(10.0) | 84(46.7) | |
| rim enhancement | 0(0.0) | 11(6.1) | |
| dark internal septations | 19(36.7) | 1(0.6) | |
| NME Distribution | 0.0071 | ||
| focal | 6 (20.0) | 5(16.7) | |
| regional | 3(10.0) | 9(30.0) | |
| segmental | 0(0.0) | 7(23.3) | |
| Internal enhancement pattern | 0.003 | ||
| homogenous | 6(20.7) | 3(10.3) | |
| heterogeneous | 2(6.9) | 16(55.2) | |
| clumped | NA | 2(6.9) | |
| clustered ring | NA | NA | |
| DWI | |||
| ADC mean (SD) | 1433.4 (374.17) | 902.9 (237.36) | <0.0001 |
| ADC max (SD) | 2133.4 (405.54) | 2041.6(442.34) | <0.0001 |
| ADC min (SD) | 681.6 (481.57) | 282.5 (306.86) | <0.0001 |
| DWI_ADCmeanCAT | <0.0001 | ||
| <1.255 × 10‐3mm2/s | 24(11.4) | 127(60.8) | |
| >1.255 × 10‐3mm2/s | 50(23.9) | 9(4.3) | |
| Signal intensity b0 | 0.0427 | ||
| isointense | 34(16.3) | 44(21.1) | |
| hyperintense | 40(19) | 92(44.0) | |
| DWI pattern b850 | <0.0001 | ||
| homogenous | 53(25.2) | 43(20.6) | |
| heterogeneous | 19(9.1) | 66(31.6) | |
| rim appearance | 2(0.96) | 27(12.9) |
High risk lesions includes: atypical ductal hypoplasia, sclerosing adenosis with atypia, metaplasia with atypia, metaplasia with atypia, complex sclerosing lesion, columnar cell changes with atypia.
Fibrocystic changes include: ductal hyperplasia, columnar cell changes, focal fibrosis, sclerosing adenosis, apocrine metaplasia, fibrocystic changes.
ADC = apparent diffusion coefficient; DWI = diffusion‐weighted imaging; NME = nonmass enhancement.