ATP1A3 and cerebellar ataxia: In addition, acute-onset choreoathetosis, dystonia and dyskinesia may be encountered in other ATP1A3-related phenotypes, such as recurrent encephalopathy with cerebellar ataxia and CAPOS syndrome (cerebellar ataxia, areflexia, pes cavus, optic atrophy, and sensorineural hearing loss) [203,204].