Hepatocellular carcinoma Liver Imaging Reporting and Data Systems treatment response assessment: Lessons learned and future directions

Figure 1 Spectrum of expected post treatment imaging appearances after successful LR TR Nonviable microwave ablation of LR 5 hepatocellular carcinoma in different patients. A: Hyperintense signal on pre-contrast T1 weighted image, which does not enhance (subtraction not shown); B: Thin continuous smooth rim of enhancement surrounding the ablation zone on portal venous phase of imaging; C: Mild peri-tumoral ill-defined geographic areas of arterial phase hyperenhancement within the parenchyma adjacent to the treatment cavity on arterial phase image, which becomes isoenhancing to the parenchyma on delayed phase of imaging (not shown).