Table 4. MRI features associated with invasion in NME lesions.
| Descriptor | Invasive carcinoma (n=24) (%) | Ductal carcinoma in situ (n=32) (%) | P value |
|---|---|---|---|
| Distribution | |||
| Focal | 4 (16.7) | 6 (18.8) | 1.000 |
| Linear | 0 (24.2) | 1 (3.1) | 1.000 |
| Segmental | 11 (45.8) | 13 (40.6) | 0.697 |
| Reginal | 0 (0.0) | 6 (18.8) | 0.071 |
| Multiple regional | 1 (4.2) | 4 (12.5) | 0.543 |
| Diffuse | 8 (33.3) | 2 (6.3) | 0.023* |
| Internal enhancement patterns | |||
| Heterogeneous | 7 (29.2) | 8 (25.0) | 0.728 |
| Clustered-ring | 7 (29.2) | 12 (37.5) | 0.515 |
| Clumped | 10 (37.5) | 12 (37.5) | 0.752 |
| Homogeneous | 0 (0.0) | 0 (0.0) | – |
| Kinetic curve | |||
| Persistent | 0 (0.0) | 2 (6.3) | 0.501 |
| Plateau | 6 (25.0) | 20 (62.5) | 0.005* |
| Washout | 18 (75.0) | 10 (31.3) | 0.001* |
| ADC value | 0.014* | ||
| >1.3×10−3 mm2/s | 0 (0.0) | 9 (28.1) | |
| ≤1.3×10−3 mm2/s | 24 (100.0) | 23 (71.9) | |
| Diffusion restriction | 0.024* | ||
| Absent | 0 (0.0) | 8 (25.0) | |
| Present | 24 (100.0) | 24 (75.0) |
*, P<0.05. NME, non-mass enhancement; MRI, magnetic resonance imaging; ADC, apparent diffusion coefficient.