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

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

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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.
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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 CT/MRI LI-RADS v2018


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

Ultrasound LI-RADS® v2017

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

LI-RADS Translations

The LI-RADS translations are now available in nine languages. These translations have been vetted by members of the LI-RADS International Working Group, who speak these languages. The LI-RADS International Working Group is Chaired by Dr. An Tang.

The translations are available for 2017 and 2018. Please visit the modality page to view and download the translations.

The American College of Radiology is not responsible for any act or omission that occurs based on a partial or complete translation of RADS content in a non-English language.

LI-RADS Steering Committee –2021 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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