Autosomal Dominant Cerebellar Ataxia Type Iii, also known as pure cerebellar syndrome-mild pyramidal signs syndrome, is related to spinocerebellar ataxia 31 and spinocerebellar ataxia 6. An important gene associated with Autosomal Dominant Cerebellar Ataxia Type Iii is CACNA1A (Calcium Voltage-Gated Channel Subunit Alpha1 A).