Figure 2. Hepatocellular carcinoma(HCC) (Edmonson Grade II) in a 46 year old man. (a) Baseline ultrasound image shows an isoechoic HCC nodule in the right lobe of the liver 3.3 cm in diameter. (b) Arterial phase image obtained at 16 s after contrast agent administration shows a homogeneous hyperenhancement of the lesion. (c) Portal phase image obtained at 113 s. The nodule is slightly hypoechoic with respect to the surrounding liver. (d) Late portal phase image obtained at 240 s. The HCC is hypoechoic with respect to the surrounding liver.