Table 1.

Typical contrast-enhanced ultrasonography characteristics of various liver tumors

Tumor	In the artery phase	In the portal phase	In the late phase
FNH	Spoked-wheel enhancement	Hyperenhancing/or with scar	Iso/hyperenhancing/or with scar
Hemangiomas	Peripheral nodular enhancement and centripetal fill-in	Partial/complete centripetal fill-in	Partial/complete centripetal fill-in
HCC	Hyperenhancing	Iso/hypoenhancement	Hypoenhancing
Metastatic tumor	Rim-like or variable intralesional enhancement	Homogeneous or heterogeneous hypoenhancement	Hypoenhancement (often marked hypoenhancement)
Hepatic carcinosarcoma	Peripheral nodular or irregular rim enhancement with large internal non-enhancing area	Peripheral isoenhancing with large internal non-enhancement area	Peripheral hypoenhancing with large internal non-enhancement area

FNH: Focal nodular hyperplasia; HCC: Hepatocellular carcinoma.