Focal bilateral thalamic, posterior internal capsule showing hyperdensity and calcification in CT scan and extensive involvement of deep white matter is characteristic of
Alexander's disease
Metachromatic leukodystrophy
Krabbe's disease
Multiple sclerosis
Krabbe's disease (globoid leukodystrophy).
Other features :

Hypodensity on T2 MRI.
Involve cerebellar white matter.