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LI-RADS categorizes observations reflecting likelihood of benignity or HCC in at-risk patients, as shown in algorithm.
 
Observations that have undergone loco-regional treatment are categorized LR-Treated.

Definitely or probably benign observations are categorized LR-1 and LR-2, respectively.
 
Masses with features that favor non-HCC malignancy are classified LR-M.
 
Masses with definite tumor in vein are categorized LR-5V.
 
Remaining masses are then categorized LR-3, LR-4, or LR-5 as shown in Table based on major features.

Smaller observations must satisfy stricter criteria to be assigned an equivalent LR category. 
 
The final category may be adjusted using ancillary features and then tie-breaking rules.
 
Click here for an Introduction to LI-RADS and information on What's New in v2014.


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