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Figure 1. Graph illustrates the hemodynamic behavior of liver lesions. Lesion conspicuity depends on the lesion-to-parenchyma echogenicity gradient; in this case, HCC has greater conspicuity during the arterial phase and appears hyperechoic. During the portal and sinusoidal phases, the lesion is first slightly and then clearly hypoechoic relative to the surrounding parenchyma.
