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

Hypodensity on T2 MRI.
Involve cerebellar white matter.