Clinical Outcomes of Patients With Suspicious (LI-RADS 4) Liver Observations.

Hepatocellular cancer (HCC) surveillance is associated with increased curative treatment and improved survival, underscoring its importance in patients with cirrhosis. Surveillance is 1 step in a larger HCC screening continuum, and those with abnormal screening results must undergo diagnostic evaluation with multiphase computed tomography (CT) or magnetic resonance imaging (MRI). The Liver Imaging Reporting and Data System (LI-RADS) classifies liver observations in at-risk patients based on risk of malignancy and HCC, with LR-5 observations having a positive predictive value exceeding 95% for HCC. However, indeterminate liver nodules (ie, LR-3 or LR-4) are commonly observed in clinical practice, associated with heterogenous HCC risk, and have large variations in practice management. We previously reported the natural history of LR-3 observations in a multicenter cohort of patients with cirrhosis, demonstrating a high annual incidence for HCC development of 8.4 cases per 100 person-years; however, the natural history of LR-4 observations remains uncertain. Herein, we aimed to characterize clinical outcomes in patients with LR-4 observations in a multicenter cohort.