Contrast-Enhanced Ultrasound Imaging in Diagnosing Liver Cancer in Patients With Cirrhosis

PRIMARY OBJECTIVES: I. To evaluate the sensitivity, specificity, positive and negative predictive values of contrast-enhanced ultrasound (CEUS) for diagnosis of hepatocellular carcinoma (HCC) in patients at risk for HCC in a multicenter setting. SECONDARY OBJECTIVES: I. To validate CEUS Liver Imaging Reporting and Data System (LI-RADS) and determine the prevalence of HCC in each CEUS LI-RADS category. II. To evaluate inter-reader reliability of CEUS for HCC diagnosis. III. To evaluate covariates that might limit diagnostic performance of CEUS for HCC diagnosis.