<unk>  <unk>  is a genetic disease with multiple types, each of which could be considered a disease in its own right.
Spinocerebellar ataxia
Episodic ataxia
Progressive supranuclear palsy
Babinski–Nageotte syndrome
Multiple system atrophy
Akinetic-rigid syndromes
Essential tremor
Metachromatic leukodystrophy