Why it is called Wallerian degeneration?
Because it was named after Augustus Waller who first described the phenomenon.
Large T1-weighted imaging (T1WI) hypointense, T2-weighted imaging (T2WI) hyperintense, fluid-attenuated inversion recovery (FLAIR) central hypointense, and peripheral hyperintense areas with severe volume loss are seen in the right temporal, frontal, and parietal lobes and the lateral part of the capsulo-ganglionic region.
These areas show facilitated diffusion.
Ex vacuo dilatation of the right lateral ventricle is noted.
Mild atrophy with T2-weighted imaging (T2WI) and FLAIR hyperintensity are seen on the right side of the midbrain and pons (along the corticospinal tract).
Impression: chronic middle cerebral artery (MCA) infarct with encephalomalacia, gliosis, and Wallerian degeneration (stage 4).