- Mass effect, sulcal effacement
- Hippocampal swelling
- Focal cortical lesions, increased T2 signal, restricted diffusion
- Migratory lesions
- Blood brain barrier breakdown, contrast enhancement
- Increased vessel caliber/flow
- Increased perfusion
| - Cerebellar diaschesis
- Unilateral/bilateral diencephalic lesions, most commonly in the pulvinar
- Splenium abnormalities
- Posterior leukoencephalopathy
|