Table 1 Categorization of breast lesions on contrast-enhanced MRI
From: Breast 3 T-MR imaging: indication for stereotactic vacuum-assisted breast biopsy
BI-RADS | Appearance on contrast-enhanced MR imaging |
|---|---|
Mass lesion | |
Category 5 | Spiculated margin Irregular lesion: rapid washout pattern and rim enhancement |
Category 4b | Irregular lesion Smooth margin: washout pattern |
Category 4a | Smooth margin: nonwashout and initial rapid rise |
Category 3 | Smooth margin: neither washout nor initial rapid rise |
Non- mass lesion | |
Category 5 | Segmental distribution and clustered ring enhancement |
Category 4b | Segmental distribution, Branching ductal pattern, Clustered ring enhancement, Clumped architecture |
Category 4a | Linear ductal pattern |
Category 3 | Not showing the characteristics of category 4 or 5 |
Focus(< 5 mm) | |
Category 4a | Rapid washout pattern |
Category 3 | Without rapid washout pattern |
Category 1, 2 | No abnormal enhancement, bilaterally symmetrical enhancement |