ATXN3 and Parkinson disease: One postmortem brain pathology study showed significant neuronal loss and depigmentation in the substantia nigra rather than neuronal loss in the cerebellum of patients with borderline repeat expansions in SCA2 and SCA3 (Park et al., 2015), which could partly explain the occurrence of the parkinsonism phenotype and good response of parkinsonism features to levodopa therapy in our study.