Evolution of Radiation-induced Brain Injury: MR Imaging–based Study

TLI from radiation is not always an irreversible and progressive process but is one that can regress or resolve at MR imaging. In the evolution of radiation injury, WMLs are seen first and are followed by contrast-enhanced lesions, which have an increasing tendency to become necrotic with increasing size. Cysts are the least frequent manifestation and arise in the late stage of TLI.