Table 4.
Malignancy rate with each ultrasound classification category
| Classification and score | Benign nodules n = 141 | Malignant nodules n = 77 | Malignancy rate | Recommended malignancy rate19 |
|---|---|---|---|---|
| BTA | ||||
| U2 | 40 | 1 | 2.4% | |
| U3 | 47 | 19 | 28.8% | |
| U4 | 43 | 29 | 40.3% | |
| U5 | 11 | 28 | 71.8% | |
| ACR-TIRADS | ||||
| TR1 | 14 | 0 | 0% | 0.3% |
| TR2 | 29 | 3 | 9.4% | 1.5 % |
| TR3 | 35 | 14 | 28.6% | 4.8% |
| TR4 | 43 | 25 | 36.8% | 9.1% |
| TR5 | 20 | 35 | 63.6% | 35% |
| AI-TIRADS | ||||
| TR1 | 44 | 3 | 6.4% | |
| TR2 | 4 | 1 | 20.0% | |
| TR3 | 36 | 16 | 30.8% | |
| TR4 | 31 | 19 | 38.0% | |
| TR5 | 26 | 38 | 59.4% | |
BTA, British Thyroid Association.
ACR-TIRADS, American College of Radiology Thyroid Imaging Reporting and Data System; AI-TIRADS, Artificial Intelligence TIRADSxMark as