Figure 4.

Hepatic angiomyolipoma in a 50-year-old woman. (a) Baseline ultrasound scan shows a homogeneously hyperechoic lesion (arrow) 2.9 cm in diameter in segment 5 of the liver. (b) In the arterial phase of contrast-enhanced ultrasound, the lesion (arrow) shows homogeneous hyperenhancement 11 s after contrast agent injection. The lesion (arrows) shows (c) isoenhancement in the portal phase (31 s after contrast agent injection) and (d) hypoenhancement in the late phase (180 s after contrast agent injection).