# of Suspicious US Features | TIRADS Category | Risk | % Risk of Maglignancy |
0 | 3 | Probably Benign | 1.7 |
1 | 4a | Low suspicion for malignancy | 3.3 |
2 | 4b | Intermediate suspicion for malignancy | 9.2 |
3 or 4 | 4c | Moderate concern but not classis for malignancy | 44.4 - 72.4 |
5 | 5 | Highly suggestive of malignancy | 87.5 |