Surveillance and diagnosis of hepatocellular carcinoma: A systematic review

Table 7 LI-RADS 2018 recommendations for untreated ≥ 1 cm lesions without pathologic proof in patients at high risk for HCC

LR-NC	Cannot be categorized (image degradation, lack of key phases)
LR-1	Definitely benign (e.g., cyst, hemangioma, perfusion alteration)
LR-2	Probably benign (probable but no definitive LR-1 findings)
LR-3	Intermediate probability of malignancy (nonmalignant and malignant entities each have moderate probability)
LR-4	High probability but no certainty of HCC
LR-5	Definitively HCC
LR-M	Probably or definitely malignant, not HCC specific (e.g., HCC not meeting LR-5 criteria, intrahepatic cholangiocarcinoma, metastases to liver)
LR-TIV	Tumor in vein

HCC: Hepatocellular carcinoma.