fig7

Figure 7. LR-4 - Probably HCC. Axial MR images of a 9 mm observation in the right hepatic lobe. T1-weighted fat saturated images performed prior to (A) as well as during the arterial phase (B), portal venous phase (C), and delayed phase (D) following contrast administration demonstrate arterial phase hyperenhancement (black arrow) of the observation which persists into the portal venous phase. Based on the size and presence of a single major feature, the appropriate category for this observation is LI-RADS 3. The observation also demonstrates mild T2-hyperintensity (white arrow, E) and restricted diffusion (white arrowhead, F). The presence of ancillary features suggestive of malignancy then allow the radiologist discretion with changing the category to LI-RADS 4 to reflect higher suspicion for HCC. HCC: hepatocellular carcinoma; LI-RADS: Liver Imaging Reporting and Data System