Spinocerebellar ataxia type 2 presenting as familial levodopa‐responsive parkinsonism

Abstract
A genetic analysis identified 2 patients, approximately one‐tenth of our patients with familial parkinsonism, who had expanded trinucleotide repeats in SCA2 genes. The reduction of 18F‐dopa distribution in both the putamen and caudate nuclei confirmed that the nigrostriatal dopaminergic system was involved in parkinsonian patients with SCA2 mutation.