Table 2.
The results of TI-RADS classification
| TI-RADS category | Malignant results | Benign results | Malignancy percentage (%) |
|---|---|---|---|
| Overall (n=3980) | 228 | 3752 | 5.7 |
| TI-RADS category 2 | 0 | 2953 | 0 |
| TI-RADS category 3 | 6 | 460 | 1.3 |
| TI-RADS category 4 | 201 | 338 | 37.3 |
| TI-RADS category 4a | 9 | 177 | 4.8 |
| TI-RADS category 4b | 50 | 115 | 30.3 |
| TI-RADS category 4c | 142 | 46 | 75.5 |
| TI-RADS category 5 | 21 | 1 | 95.4 |
| Nodules of <10 mm (n=2766) | 115 | 2651 | 4.2 |
| TI-RADS category 3 | 1 | 126 | 0.8 |
| TI-RADS category 4 | 102 | 142 | 4.2 |
| TI-RADS category 4a | 1 | 47 | 2.1 |
| TI-RADS category 4b | 29 | 67 | 30.2 |
| TI-RADS category 4c | 72 | 28 | 72.0 |
| TI-RADS category 5 | 12 | 0 | 100.0 |
| Nodules of ≥10 mm (n=1214) | 113 | 1101 | 9.3 |
| TI-RADS category 3 | 5 | 334 | 1.5 |
| TI-RADS category 4 | 99 | 196 | 33.6 |
| TI-RADS category 4a | 8 | 130 | 5.8 |
| TI-RADS category 4b | 21 | 48 | 30.4 |
| TI-RADS category 4c | 70 | 18 | 79.5 |
| TI-RADS category 5 | 9 | 1 | 90.0 |
Note: TI-RADS = thyroid imaging reporting and data system. TI-RADS category 3 (no suspicious features), TI-RADS category 4a (1 suspicious feature), TI-RADS category 4b (2 suspicious features), TI-RADS category 4c (3 or 4 suspicious features), TI-RADS category 5 (5 suspicious features); suspicious features in ultrasound scan were solidity, hypoechogenicity or marked hypoechogenicity, microlobulated or irregular margins, microcalcifications, and taller-than-wide shape.