The short answer
ACR TI-RADS looks at five ultrasound features of a thyroid nodule to sort it into a risk level. The level, together with the nodule size, helps decide whether a needle biopsy or repeat scans are needed.
TI-RADS is an estimate of risk from an ultrasound image. It is not a diagnosis.
The level is only part of a recommendation. Ask how the nodule size fits in.
More than one TI-RADS exists, so it is worth asking which system produced the number on your report.
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This page is for people who see a TI-RADS score on a thyroid ultrasound report. It explains what the system looks at and what to ask.
A scoring system, not a diagnosis
TI-RADS stands for Thyroid Imaging Reporting and Data System. The version used across much of the United States is ACR TI-RADS. The American College of Radiology (ACR) published it in the Journal of the American College of Radiology in 2017.
The ACR says the work set out to do three things. It aimed to guide care for nodules, build a shared vocabulary for describing them, and create a risk system.
The system runs on how a nodule looks on an image. It does not diagnose cancer. Only a sample of cells, read by a pathologist, can say what a nodule is.
What is looked at
ACR TI-RADS judges five kinds of ultrasound features:
- Composition
- Echogenicity, or how bright the nodule looks
- Shape
- Margin, or the edge of the nodule
- Echogenic foci, such as tiny bright spots
The radiologist scores these features and the total gives a level. The levels run from TR1 to TR5. Ask your radiologist or care team how your total was reached.
Level and size go together
A level alone is not a plan. The nodule's size also matters when the team decides on a needle biopsy, repeat scans, or neither. Ask what size thresholds apply to your level.
Limits to know about
The features are judged by eye. Different readers may score the same nodule differently. TI-RADS is also not one thing. Other groups publish their own versions, so a number without a system name can be unclear.
When a report gives no level
Many reports describe nodules in words only. That is common. You can ask:
- Which system, if any, was used?
- What size is the nodule in its largest direction?
- Which features were described?
- Is there an earlier scan to compare with?
- Who decides whether a needle sample is needed, and when?
Related reading
For what comes next, see Thyroid Nodule on Ultrasound: What Now and What Does Bethesda Category Mean on a Thyroid Biopsy.
Sources
Common questions
Does a TI-RADS level tell me if I have thyroid cancer?
No. It is a structured estimate of risk from an ultrasound image. Only cells taken by fine-needle aspiration and read by a pathologist can say what a nodule is.
Is every TI-RADS the same?
No. ACR TI-RADS is one of several systems, alongside others. They can use different points and thresholds.
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Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
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