Liver Reporting & Data System (LI-RADS®)

LIRADS_320LI-RADS® was created to standardize the reporting and data collection of CT and MR imaging for hepatocellular carcinoma (HCC).

This method of categorizing liver findings for patients with risk factors for developing HCC allows the radiology community to:

  • Apply consistent terminology
  • Reduce imaging interpretation variability and errors
  • Enhance communication with referring clinicians
  • Facilitate quality assurance and research

LI-RADS® CT/MRI and LI-RADS® US are consistent with and integrated into the American Association for the Study of Liver Diseases (AASLD) 2018 hepatocellular carcinoma (HCC) clinical practice guidance.

License Information
Creative Commons License
Liver Imaging Reporting and Data System (LI-RADS®) by American College of Radiology is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Permissions beyond the scope of this license may be available here.

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LI-RADS® Current Releases

LI-RADS Lexicon (terms and definitions)

LI-RADS Lexicon as of June 2021
Access LI-RADS lexicon


LI-RADS® version 2018 provides updated criteria for small (10-19 mm) LR-5 observations and a simplified definition for threshold growth.
Access LI-RADS® CT/MRI v2018


LI-RADS® CEUS is a standardized system for technique, interpretation, reporting, and data collection for contrast-enhanced ultrasound exams in patients at risk for developing HCC.
Access LI-RADS® CEUS v2017

LI-RADS® Ultrasound

The  LI-RADS® Ultrasound covers everything needed to apply LI-RADS® US Screening and Surveillance algorithm.
Access LI-RADS® Ultrasound v2017

LI-RADS Translations

ACR disclaims liability for any acts or omissions that occur related to an individual's or entity's use of ACR's RADS, including but not limited to, translations of a specific RADS work.

For a full list of RADS Translated documents, please visit the RADS Translations page.

LI-RADS Steering Committee – Roster

Archived Releases

Future Releases

The ACR has announced the formation of a new working group:

Treatment Response (TR) LI-RADS Workgroup — Chaired by Dr. Richard K. Do, from Memorial Sloan Kettering Cancer Center

In collaboration with the LI-RADS Steering Committee, the LI-RADS TR WG will develop and refine a standardized system for the interpretation, reporting and data collection for treatment response assessment in patients who undergo liver-directed treatments for known or suspected HCC. The system will be called ACR TR LI-RADS, or TR LI-RADS for short. It will include a lexicon of controlled terminology, an illustrative atlas, reporting guidelines, and educational material. It will be updated as experience accrues, as knowledge add technology advance, and in response to user feedback.

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