Fig. 2. Appearance at a 6-week examination after microwave ablation of a solitary colorectal liver metastasis.

A. With conventual B-mode imaging, only the size of the lesion can be evaluated. No information regarding tissue viability can be extracted. B. In an examination using contrast-enhanced ultrasound, the ablated area shows a sharply demarcated total non-enhancing area, which indicates successful ablation without any signs of viable remaining tumor tissue.