ATXN2 and retinitis pigmentosa: In the literature has been reported massive expansion repeats (more than 750 repeats) in SCA2 with autonomic dysfunction, retinitis pigmentosa, and infantile spasms; the difference in the present case without retinitis pigmentosa, not only be explained by the age of onset, but also by the same molecular and allelic heterogeneity of retinitis, which is polygenic with different inheritance patterns (Fahim et al., 2018).