Adult-onset familial laryngeal abductor paralysis, cerebellar ataxia, and pure motor neuropathy.

Two brothers presented with late-onset cerebellar ataxia and severe dysphonia. Brain MRI showed vermian and hemispheric cerebellar atrophy. Laringofiberscopy revealed laryngeal abductor paralysis in both patients. Neurophysiologic studies showed a pure motor neuropathy. The combined findings and the molecular analysis suggest a new familial disorder. Inheritance is most likely autosomal recessive, but X-linked transmission is also possible.