CEUS LI-RASD apply to lesion visible at precontrast ultrasound but not the lesion invisible. Fusion imaging can use to invisible lesions at precontrast ultrasound in clinical practice. Thus, our aim is to explore the application value of CEUS LI-RADS in contrast-enhanced fusion imaging for focal liver lesions that are not visible on conventional ultrasound in high-risk patients with hepatocellular carcinoma.

Inclusion Criteria:

Patients at risk for HCC(Cirrhosis or Chronic hepatitis B viral infection or Current or prior HCC) Suspicious lesions detected by CECT/MRI but not visible on conventional ultrasound and US-CECT/MRI fusion imaging Patients sign the informed consent.

Exclusion Criteria:

Patients without risk of HCC(With cirrhosis due to congenital hepatic fibrosis or With cirrhosis due to a vascular disorder such as hereditary hemorrhagic telangiectasia, Budd-Chiari syndrome, chronic portal vein occlusion, cardiac congestion, or diffuse nodular regenerative hyperplasia) Patients without a successful registration or lesions can be seen on conventional ultrasound after successful registration Pregnancy or lactation Patients with pretreat lesion Patients don't sign the informed consent.