Figure 14b. Hypervascular liver metastases in a 60-year-old man with previously resected retroperitoneal sarcoma. (a) Early arterial phase US image obtained 20 seconds after contrast material injection shows a large lesion with heterogeneous and mostly peripheral (nonglobular) enhancement (large arrows). Two small lesions remain hypoechoic (small arrows). (b) Delayed arterial phase US image obtained 34 seconds after injection shows homogeneous enhancement of the large lesion and one of the small lesions (large arrows) and rim enhancement of the other small lesion (small arrow). Note that, in this case, lesion enhancement is variable and asynchronous.