Imaging before and after embolization. Before embolization; in (a), a central lesion (pointed by the arrow) is shown on MRI, and in (b), two spherical abnormalities (pointed by the arrows) are shown on angiography, caused by hypervascularization of two metastases. After successful embolization; in (c), only normal liver parenchyma is remaining, and after 6 months, only a small necrotic lesion is left (pointed by the arrow) in (d) on MRI.