Figure 1a:

Diagram shows changes introduced in Liver Imaging Reporting and Data System (LI-RADS)version 2018. (a) Changes in categorization. Observations 10–19 mm with arterial phase hyperenhancement (APHE) and nonperipheral “washout” are categorized as LR-5 (definite hepatocellular carcinoma), regardless of appearance on antecedent surveillance US images. Qualifiers “-us” and “-g” have been removed. (b) Change in threshold growth definition. Only 50% size increase in 6 months or less qualifies as threshold growth; all other size increases qualify as subthreshold growth.