Back in 1984 many cases which were termed '
idiopathicBell's palsy
Fibrous dysplasia
Guillain-barre syndrome
Hypertrophic cardiomyopathy
Idiopathic aplastic anemia
Juvenile rheumatoid arthritis
Orbital pseudotumor
Pseudotumor cerebri', ie just means no cause found, may be diagnosable today with modern technology. A repeat evalaution may be indicated.
There are a wide variety of causes of
cerebellarAcute cerebellar ataxia degenerationMacular degeneration from drug side effect (eg phenytoin) to alcohol to cerebral congenital malformations (eg Dandy Walker variant) to degenerative disorders (eg Olivopontocerebellar degeneration)genetic causes. There has been a huge expansion of genetic discoveries in the group of disorder known as spinocerebellar degeneration - if any other family members are involved, considr being evaluated for this.
The prognosis depends on the underlying cause.
I am dealing with "idiopathic" issues right now and this is what I gather in all my research and I feel it relates to your Dad! Doctors know "many things" but the things they can't figure out they name idiopathic, cause unknown. It goes to show, in your Dad's case, that he was stronger than his idiopathic condition!All the power to him!