ACR LI-RADS

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Major features

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Definition:

Imaging features used to categorize LR-3, LR-4, or LR-5 masses.

Comments:

Major features are applied to masses that are neither definite benign entities (LR-1) nor probable benign entities (LR-2), that lack features that favor non-HCC malignancy (LR-M), and that are not associated with tumor in vein (LR-5V). Major features include:

Diameter < 10mm, diameter 10-19mm, diameter ≥ 20mm OR
For arterial phase hypo- or isoenhancing masses: Diameter < 20mm, diameter ≥ 20 mm
For arterial phase hyperenhancing masses: Diameter < 10mm, diameter 10-19mm, diameter ≥ 20 mm
Features seen on CT and MR can be integrated to yield the final LI-RADS category. If this is done, it must be explicitly stated in the radiology report

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