Diagnostic performance of US LI-RADS in hepatocellular carcinoma surveillance

BackgroundLiver cirrhosis and chronic infection with hepatitis B virus are major risk factors for hepatocellular carcinoma (HCC). Guidelines recommend ultrasound (US) surveillance for population at risk of HCC. The US Liver Imaging Reporting and Data System (LI-RADS) aims at standardization of interpretation, reporting, and management recommendations for US surveillance examinations. The aim of this study is to assess the diagnostic accuracy of US LI-RADS in early HCC detection in patients at risk.ResultsThis retrospective study included patients with surveillance US between January 2018 and January 2020 who had a contrast-enhanced CT or MRI of the liver within 1 month from the date of US examination. Visualization scores and US categories were assigned according to the US LI-RADS lexicon. A total of 264 participants were eligible for the study. HCC was diagnosed in 33 participants. The US-3 category had a 39.4% sensitivity and 93.5% specificity for HCC detection. The US-2 category had a 45.4% sensitivity and 87% specificity for HCC detection. The visualization score C showed the highest number of HCC (19/33) and had the highest false-negative rate (76%, 13 of 17).ConclusionsBoth US-2 and US-3 categories showed high specificity and low sensitivity for HCC detection in the setting of surveillance of patients at high risk. Visualization score C had the highest risk for HCC and the highest rate of false-negative results. Intense surveillance by contrast-enhanced CT or MRI might be beneficial for patients with limited visualization scores B and C.