Effects of Gray-Scale Ultrasonography Immediate Post-Contrast on Characterization of Focal Liver Lesions

Figure 1

A 39-year-old man was found to have a liver tumor during the routine ultrasound examination. (a) US pre-CEUS showed an ellipsoidal tumor with heterogeneous appearance in the left liver lobe. Its front boundary was not clear due to disturbance of noise. (b) US post-CEUS showed that the tumor represented homogeneous iso-echo and had clear border and halo sign (↑) at 7 minutes after contrast agent injection. Then, the tumor was regarded as possibly malignant. (c) The tumor was confirmed as HCC by surgery pathology and gross specimen showed the fibrous membrane (↑) around the tumor, which had good correlation to halo sign on US post-CEUS.

(a)

(b)

(c)