Use of second generation contrast-enhanced ultrasound in the assessment of focal liver lesions

Figure 4 Liver metastasis in a patient with known metastatic colon carcinoma. The patient previously had liver resection and radiofrequency ablation. Contrast-enhanced CT scan image (A) and split-screen display images of a contrast-enhanced US scan using a low MI technique (B and C). On CT, a 1cm lesion is seen in segment 8 (arrow, A). The lesion was not visualized on gray-scale US. After injection of microbubbles, a 1 cm hypoechoic rounded lesion is seen as a defect in all the phases of enhancement (arrow, B and C). These findings are suspicious for a metastatic deposit.