Figure 3. Hepatocellular carcinoma(HCC) (Edmonson grade III) in a 51-year-old man. (a) Baseline ultrasound image shows a hypoechoic HCC nodule in the right lobe of the liver 2.0 cm in diameter. (b) Arterial phase image obtained 23 s after contrast agent administration shows a homogeneous hyperenhancement of the lesion. (c) Portal phase image obtained at 48 s. The nodule is slightly hypoechoic with respect to the surrounding liver. (d) Late portal phase image obtained at 180 s. The HCC is hypoechoic with respect to the surrounding liver.