Radiology reporting standard

LI-RADS

LI-RADS is the American College of Radiology system for liver observations on CT and MRI in patients at risk for hepatocellular carcinoma, assigning categories from LR-1 (definitely benign) to LR-5 (definitely HCC), plus LR-M, LR-TIV and LR-NC.

LI-RADS through RadVector API LI-RADS in RadVector Reporting

Draft · advisoryDraft criteria pack under validation; RadVector answers as advisory and marks the result not usable for output.

At a glance

What LI-RADS is

Full name: Liver Imaging Reporting and Data System (CT/MRI)
Edition RadVector applies: CT/MRI LI-RADS v2018
Published by: American College of Radiology (ACR)
Applies to: Liver observations on CT or MRI in patients at risk for hepatocellular carcinoma (cirrhosis, chronic hepatitis B, or prior HCC).
Modality: Liver CT and MRI

Official source: ACR LI-RADS

LI-RADS categories

LR-1 / LR-2: Definitely or probably benign.
LR-3: Intermediate probability of malignancy.
LR-4: Probably HCC.
LR-5: Definitely HCC.
LR-M: Probably or definitely malignant, not specific for HCC.
LR-TIV: Tumor in vein.
LR-NC: Not categorizable because of image degradation or omission.

A short summary in our own words. Use the official LI-RADS documents for the complete criteria.

How RadVector applies it

LI-RADS, applied the same way every time.

The same deterministic engine grades LI-RADS inside RadVector Reporting and through RadVector API, and a test keeps the two answers identical.

Assigns no LR category unless the report states the patient is at risk (cirrhosis, chronic hepatitis B or prior HCC); otherwise it says LI-RADS does not apply.
Applies LR-TIV, then LR-M, then the benign categories, then the diagnostic table of arterial phase hyperenhancement, size and the additional major features.
Never assumes arterial hyperenhancement or washout; computes threshold growth from stated prior sizes.

Radiologists and imaging centers

RadVector Reporting supplies the LI-RADS category and recommendation to the report draft from the radiologist's own findings, cites the guidance applied, and keeps a per-report governance record. The radiologist signs.

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Software teams and AI companies

RadVector API returns the LI-RADS verdict with pack version, validation status and a trace id, as JSON or FHIR R4, with a sandbox key and synthetic fixtures to start.

Developer guide

Hospitals and enterprise imaging

One versioned LI-RADS implementation across reporting, QA and other AI systems' results, with an audit trail of which pack version graded each report.

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LI-RADS questions

When does LI-RADS apply?

CT/MRI LI-RADS applies to patients at risk for hepatocellular carcinoma: those with cirrhosis, chronic hepatitis B, or current or prior HCC. RadVector checks that the report states such a risk before assigning any LR category and otherwise answers that LI-RADS does not apply.

Can RadVector API return a LI-RADS category?

Yes. Send the observation's size and features, or the report text, and RadVector API returns the LR category with its pack and version, or a deferral naming the feature it needs. The LI-RADS pack is a draft under validation, so answers are advisory today.

Other reporting standards

RadVector is clinical decision support for qualified professionals, not a diagnostic device; the radiologist makes the final determination.