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| Exposure factors | Score |
|---|---|
| BMI | |
| <25 | 0 |
| ≥25 | 1 |
| SLN aspect ratio of US | |
| ≤2 | 1 |
| >2 | 0 |
| CEUS enhanced mode | |
| I | 0 |
| II/III | 2 |
| SLN aspect ratio of Mammography | |
| ≤2 | 2 |
| >2 | 0 |
| Lympho-vascular invasion | |
| No | 0 |
| Yes | 3 |
| CK5/6 | |
| Negative | 2 |
| Positive | 0 |
BMI, body mass index; SLN, sentinel lymph node; CEUS, contrast-enhanced ultrasound; CK5/6, cytokeratin 5/6.
