ACR TI-RADS
Oncology, staging and radiology
Also known as: ACR Thyroid Imaging Reporting and Data System · ACR TI-RADS (thyroid nodule ultrasound, TR1–TR5)
What it is for
Point system of the American College of Radiology for thyroid nodules on ultrasound: one feature is chosen from each of the first four categories and all that apply from echogenic foci; the sum gives the TI-RADS level. Other systems (EU-TIRADS, K-TIRADS) use different rules.
Classification
| Category | Description |
|---|---|
| Composition | cystic or almost completely cystic 0; spongiform 0; mixed cystic and solid 1; solid or almost completely solid 2. |
| Echogenicity | anechoic 0; hyper- or isoechoic 1; hypoechoic 2; very hypoechoic 3. |
| Shape (transverse plane) | wider-than-tall 0; taller-than-wide 3. |
| Margin | smooth 0; ill-defined 0; lobulated or irregular 2; extrathyroidal extension 3. |
| Echogenic foci (add all) | none or large comet-tail artefacts 0; macrocalcifications 1; peripheral (rim) calcifications 2; punctate echogenic foci 3. |
| TR1 | 0 points — benign (cystic and spongiform nodules get no further points). |
| TR2 | 2 points — not suspicious. |
| TR3 | 3 points — mildly suspicious. |
| TR4 | 4–6 points — moderately suspicious. |
| TR5 | ≥7 points — highly suspicious. |
| Note | nodule size is a sixth element used only for the follow-up and aspiration thresholds of each level. |
Source
ACR Thyroid Imaging, Reporting and Data System (TI-RADS): White Paper of the ACR TI-RADS Committee
ACR · J Am Coll Radiol 2017;14:587–595 (Tessler FN et al.)
DOI: 10.1016/j.jacr.2017.01.046
PMID: 28372962
- Edition
- ACR TI-RADS 2017 (white paper of the ACR TI-RADS Committee)
- Checked on
Summary of the published classification in our own words. Not a substitute for the original publication.
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