**4. Chronic non-progressive ataxias**

Chronic non-progressive ataxias are conditions that manifest with chronic ataxia with a stable (non-progressive) evolution. In this group are included congenital ataxias and their four subgroups recently proposed: cerebellar malformation, syndromic congenital ataxias, congenital cerebellar hypoplasia, and pontocerebellar hypoplasia [47]. Cerebellar structural disruption related to congenital infectious, tumours and stroke are also chronic non-progressive ataxias (**Table 3**).
