Table 4 Categorization and case number of breast lesions on contrast- enhanced MRI
From: Breast 3 T-MR imaging: indication for stereotactic vacuum-assisted breast biopsy
BI-RADS category | Appearance on contrast-enhanced MR imaging | Sub-total | Benign | Malignancy |
|---|---|---|---|---|
Mass lesion | ||||
Category 5 | Spiculated margin Irregular lesion: rapid washout pattern and rim enhancement | - | - | - |
Category 4b | Irregular lesion Smooth margin: washout pattern | 1 | - | 1 |
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 | 2 | - | 2 |
Category 4b | Segmental distribution, Branching ductal pattern, Clustered ring enhancement, Clumped architecture | 16 | - | 16 |
Category 4a | Linear ductal pattern | 1 | 1* | - |
Category 3 | Not showing the characteristics of category 4 or 5 | 6 | 6 | - |
Focus (<5 mm) | ||||
Category 4a | Rapid washout pattern | - | - | - |
Category 3 | Without rapid washout pattern | 8 | 7 | 1 (DCIS) |
Category 1, 2 | No abnormal enhancement, bilaterally symmetrical enhancement | 21 | 20 | 1** |
Total | 55 | 34 | 21 | |