ATXN2 and Parkinson disease: Parkinsonism is also frequent among the few patients with SCA2 homozygosity, where generally the same vulnerability pattern was observed, but relatively early affection of the retina, the oculomotor, reticulotegmental, facial, lateral vestibular, raphe interpositus nuclei in the brainstem and some pyramidal cells in the primary motor cortex was reported [27]–[29].