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![Assessment of response to liver directed radiation-based therapies: Current guidelines, challenges, and future directions](https://image.oaes.cc/2873b637-e4cb-4913-b722-470f11e30900/5378.fig.2.jpg)
Figure 2. 76-year-old male, hepatitis C cirrhosis, MR images. On pretreatment images, a 4.3 cm arterial phase hyperenhancing (asterisk) observation with portal venous phase washout (arrows) in the right lobe is consistent with HCC (LR-5). Follow-up images 6 months after Y-90 radioembolization shows a larger appearance of the mass due to treatment changes. The lack of arterial phase hyperenhancement (asterisk) and irregular progressive enhancement on portal venous phase (black arrows) are consistent with post-treatment changes (LR-TR Nonviable).