What this calculator does
Structures liver observation categorization across the supported LI-RADS imaging pathways.
Select the examination pathway and supply its major features, size, and ancillary pathway inputs.
Clinical scope
Use the appropriate LI-RADS pathway for patients who meet that pathway's at-risk population criteria: CT/MRI diagnosis, ultrasound surveillance, CEUS diagnosis, or treatment response. Each pathway has distinct eligibility and category rules.
Applicability and exclusions
- Do not apply diagnostic CT/MRI or CEUS categories when the patient does not meet the defined at-risk population criteria.
- Do not mix surveillance, diagnostic, and treatment-response descriptors; pediatric patients and vascular or benign mimics may require separate frameworks.
Method and calculation logic
Select the pathway before entering features. CT/MRI uses major and ancillary features; surveillance US uses observation and visualization findings; CEUS uses enhancement and washout; treatment response uses therapy-specific viability criteria.
Interpretation table
| Pathway | Representative categories |
|---|---|
| CT/MRI diagnostic | LR-1 to LR-5, LR-M, LR-TIV, LR-NC |
| US surveillance | US-1 to US-3 plus visualization score |
| CEUS diagnostic | CEUS LR categories |
| Treatment response | Therapy-specific LR-TR categories |
Worked example
Case: Fictional example: an observation in an eligible at-risk patient is evaluated on multiphasic MRI using the CT/MRI diagnostic pathway.
Calculation: Enter size, nonrim arterial phase hyperenhancement, major features, and any ancillary-category adjustment only after confirming pathway eligibility.
Interpretation: Check the generated LR category against the pathway's current diagnostic table and report all relevant observations, not only the highest category.
How to use this calculator
- Complete the visible imaging and measurement fields. Required inputs are marked in the workbench.
- Review the calculated category, score, measurements, and any recommendation or warning.
- Copy the report-ready text only after checking the result against the complete examination and source guideline.
Calculator-specific questions
Can LI-RADS be used in every patient with a liver lesion?
No. Diagnostic pathways are limited to specifically defined at-risk populations.
Are CT/MRI, CEUS, US surveillance, and treatment response one scoring system?
No. They are related but distinct algorithms; always select and cite the correct pathway and version.
Are patient measurements sent to RadPhrases?
No. Calculator inputs and results are processed in the browser and are not submitted by this page.