SCA type 8

Spinocerebellar ataxia (SCA) is a progressive, degenerative,[1] genetic disease with multiple types, each of which could be considered a disease in its own right. An estimated 150,000 people in the United States are diagnosed with Ataxia, SCA's are the largest group of this hereditary, progressive, degenerative and often fatal neurodegenerative disorders. There is no known effective treatment or cure. Ataxia can affect anyone of any age. It is caused by either a recessive or dominant gene. Many times people are not aware that they carry the ataxia gene until they have children who begin to show signs of having the disorder.[2]

Please note that while I do suffer from this disease and its effects, and I do appreciate this short definition of it provided by Wikipedia, I in no way endorse the apostrophe in the mention of plural SCAs. That is just plain wrong by any standard.