- Typical imaging features of hepatocellular carcinoma: liver lesion shows arterial hypervascularity and venous or delayed phase washout in multidetector CT scan and / or dynamic contrast enhanced MRI. a: If the liver lesion diameter≥2cm, the diagnosis of hepatocellular carcinoma can be made when typical imaging features show in one of the imaging methods. b: If the liver lesion diameter is between 1 to 2cm, the diagnosis of hepatocellular carcinoma can be made when typical imaging features show in both of the imaging methods.