<unk>  is hereditary, but has an unknown genetic basis. There are two forms: Number OMIM Alt. name Inheritance<unk>  type 2 Fickler-Winkler type<unk>  autosomal recessive<unk>  type 5<unk>  with dementia and extrapyramidal signs autosomal dominant A few non-hereditary diseases formerly categorized as<unk>  have been reclassified as forms of multiple system atrophy as well as to four hereditary types, that have been currently reclassified as four different forms of spinocerebellar ataxia: Hereditary<unk>  type<unk>  name SCA # Gene OMIM<unk>  type 1 "Menzel type<unk> " SCA1 ATXN1<unk>  type 2, autosomal dominant "Holguin type<unk> " SCA2 ATXN2<unk>  type 3 "OPCA with retinal degeneration" SCA7 ATXN7<unk>  type 4 "Schut-Haymaker type<unk> " SCA1 ATXN1
Olivopontocerebellar atrophy
Cerebellar abiotrophy
Cerebellar hypoplasia
Pontocerebellar hypoplasia
Coprolalia
Cerebellar agenesis
Dentatorubral–pallidoluysian atrophy
Harding ataxia