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Protocol for readjusting the Breast Imaging Reporting and Data System category with contrast-enhanced ultrasound
| Initial category | Number of independent risk factors | Modified BI-RADS category |
| BI-RADS 4a | 0 | Reduce to 3 category |
| 1 | Remains unchanged | |
| 2 | Increase one category | |
| BI-RADS 4b | 0 | Reduce to 3 category |
| 1 | Remains unchanged | |
| 2 | Increase one category | |
| BI-RADS 4c | 0 | Reduce to 4a category |
| 1 or 2 | Increase to 5 category |
BI-RADS: Breast Imaging Reporting and Data System.
