Table 1 Classifications of the three ultrasound-based risk stratification systems

ACR-TIRADS*

0 Points

TR1 (Benign, aggregate risk level 0.3%)

2 Points

TR2 (not suspicious, aggregate risk level 1.5%)

3 Points

TR3 (mildly suspicious, aggregate risk level 4.8%)

4–6 Points

TR4 (moderately suspicious, aggregate risk level 9.1%)

 ≥ 7 Points

TR5 (highly suspicious, aggregate risk level 35.0%)