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Thresholds for FNA or follow-up by category with ACR-TIRADS and AI-TIRADS
| TIRADS grad | FNA indicated | Follow-up indicated |
|---|---|---|
| TR 1 | no | No |
| TR 2 | no | No |
| TR 3 | ≥2.5 cm | ≥1.5 cm 1,3 and 5 years |
| TR 4 | ≥1.5 cm | ≥1 cm 1,2,3 and 5 years |
| TR 5 | ≥1 cm | ≥0.5 cm annual for up to 5 years |
ACR-TIRADS, American College of Radiology Thyroid Imaging Reporting and Data System; AI-TIRADS, Artificial Intelligence TIRADS; FNA, fine needle aspiration.
