Other: ILN Cohort

Patients with LR3 observations would undergo CEUS and AMRI every 6 months; patients with LR4 observations would undergo CEUS and AMRI 3 months after enrollment and every 6 months thereafter. CEUS and AMRI will preferably be done the same day to minimize burden on the patient, although will be permitted to be completed within 14 days of each other. This interval is sufficiently short to minimize the chance of intervening events. AMRI and CEUS will be performed every 3-6 months until HCC development, regression to LR-1 or LR-2 (i.e., definitely or likely benign, respectively), or end of follow-up at 24 months post-enrollment.