Table 3.
Malignancy Risk of Thyroid Nodules Assessed by Two US Scoring Systems: K-TIRADS and ACR-TIRADS
| US system | TIRADs category | Total | Benign | Malignant | P value | Recommended malignancy risk, % |
|---|---|---|---|---|---|---|
| K-TIRADS | 2 | 1 | 1 (100.0) | 0 | <0.001 | <3 |
| 3 | 46 | 42 (91.3) | 4 (8.7) | 3–15 | ||
| 4 | 44 | 28 (63.6) | 16 (36.4) | 15–50 | ||
| 5 | 109 | 15 (13.8) | 94 (86.2) | >60 | ||
| Total | 200 | 86 (43.0) | 114 (57.0) | |||
|
| ||||||
| ACR-TIRADS | 2 | 12 | 12 (100.0) | 0 | <0.001 | ≤2 |
| 3 | 28 | 24 (85.7) | 4 (14.3) | ≤5 | ||
| 4 | 51 | 34 (66.7) | 17 (33.3) | 5–20 | ||
| 5 | 109 | 16 (14.7) | 93 (85.3) | ≥20 | ||
| Total | 200 | 86 (43.0) | 114 (57.0) | |||
Values are expressed as number (%).
US, ultrasonography; K-TIRADS, Korean Thyroid Imaging Reporting and Data System; ACR-TIRADS, American College of Radiology Thyroid Imaging Reporting and Data System.