fig5

Figure 5. 89-year-old male, chronic hepatitis B infection, arterial phase CT images. Pretreatment image shows a 2.3 LR-5 observation with APHE and washout (not shown), consistent with hepatocellular carcinoma (HCC). Three-month follow-up image after Y-90 shows peripheral nodular arterial phase hyperenhancement (APHE) along the treatment zone (black arrow) measuring 1.1 cm, which fulfills the criteria for residual viable tumor according to LR-Treatment response algorithm (LR-TRA) and mRECIST. On 6 and 9 months follow-up, note progressive decrease in size, consistent with tumor response (white arrows). Ill-defined APHE is still observed on the 9-month follow-up.