The most common types of ataxia were SCA3 (N = 44), FRDA (N = 22), SCA6 (N = 19), SCA14 (N = 12) and ataxia due to cerebellar stroke within the territory of the posterior inferior cerebellar artery (PICA stroke; N = 17, whereof 15 unilateral, and 2 bilateral). This evidence concerns the gene CACNA1A and cerebellar ataxia.