Table 4.
Typical enhancement pattern for the characterization of focal liver lesions
| Lesion | Arterial phase | Portal venous and late phase |
| Hemangioma (Figures 1 and 2) | Circular vascular enhancement without central intratumoral vessels | Nodular enhancement and "fill-in" pattern |
| Focal nodular hyperplasia (Figures 3 and 4) | Radial centrifugal or "spoke wheel" pattern, then rapid, complete hyperhancement | Iso- or hyperenhancement |
| Focal fatty sparing (Figure 5) | Central arterial blood supply | Isoenhancement |
| Metastasis (Figure 6) | Asymmetrical, chaotic enhancement configuration | Hypoenhancement |
| Hepatocellular carcinoma (Figure 7) | Hyperenhancement and disorganized vascularity | Iso- or hyperenhancement, depending upon tumor differention |
Reproduced with permission from reference Dietrich et al[81].