CACNA1A and cerebellar ataxia: Cho/Cr: The cerebellum of SCA2 patients had lower Cho\Cr ratios than other ataxia subtypes, including SCA1, SCA3, SCA6, and FA (U = 9.500, z = −3635; U = 18.000, z = −4.033, U = 1.000, z = −4.540; and U = 126.000, z = −2.751, respectively).