Head & Neck
ACR TI-RADS: Thyroid Ultrasound Is Triage, Not Cataloguing
Fellowship-level neuroradiology teaching by E. Brooke Schrickel, MD. Open this topic in the interactive reading room →
Watch · concise explainerVisual summary
Core clinical idea
Thyroid US is triage, not cataloguing: recognize the dismissible nodule patterns fast, point your scoring only at the few nodules that could change management, and report only those — the classic miss is treating TI-RADS as a describe-every-nodule obligation that buries the one needing FNA.
Bottom line
TI-RADS is a triage tool — dismiss the benign patterns fast, score only what could change management, and let clinical context override the points.
Core workstation questions
- Has the whole gland been surveyed so I'm scoring the right targets, or just whatever appeared first?
- Is this one of the dismissible patterns (TR1 cystic/spongiform, TR2 mixed iso/hyperechoic), and are its benign features actually clean?
- For mixed nodules, am I judging echogenicity off the solid component? Is 'very hypoechoic' referenced to strap muscle?
- Does clinical context (PET-avid, suspicious ipsilateral node, prior biopsy) push me off the standard recommendation?
- Am I over-reporting — describing nodules that don't meet biopsy or follow-up criteria?
What changes reporting / management
- Report only nodules meeting criteria for biopsy or follow-up; cap the report at the few most suspicious when many qualify.
- A suspicious ipsilateral node or PET-avid nodule can warrant biopsy even when points alone wouldn't trigger it.
- For a previously biopsied nodule, still score and give the TI-RADS recommendation but flag prior sampling.
- A normal-appearing gland or non-qualifying nodules don't need the full template.
Practical traps
- Treating TI-RADS as describe-every-nodule, wasting time and burying the actionable nodule.
- Letting a cystic-appearing nodule with eccentric mural nodularity, punctate echogenic foci, or taller-than-wide shape pass as a dismissible 'good nodule'.
- Judging echogenicity off the wrong reference (must be solid component for mixed nodules; very-hypoechoic is relative to strap muscle).
- Calling a nodule spongiform without confirming absence of aggressive features.
Teaching pearls
- You don't need to describe, score, or report every nodule — only the ones that change management.
- Learn the dismissible patterns cold; that's where the time savings live.
- Judge echogenicity off the right reference — solid component for mixed nodules, strap muscle for very-hypoechoic.
- A suspicious node or PET avidity can override the TI-RADS score — biopsy on the clinical picture.
Teaching visuals
Source lectures
- ACR TI-RADS Overview and Approach
Educational material for radiology residents and neuroradiology fellows. Nothing here drives individual patient care, and it contains no patient data.