fig1

Figure 1. Hepatocellular carcinoma (HCC). 64-year-old male with a history of cirrhosis related to alcohol and fatty liver. Mass found on regular US surveillance. A greyscale image shows a small hypoechoic liver nodule in a very heterogeneous liver (A); at the peak of arterial phase (AP) enhancement, 20 s, the mass is brightly enhanced (B); at one minute, there is isoenhancement. The nodule is now invisible but marked by the arrow (C); there is late and weak washout at 3 min. Weak washout shows less enhancement than the immediately adjacent liver parenchyma but retains bubble signals within the nodule as here. AP hyperenhancement and late weak washout comprise the diagnostic features of HCC (D)