medication for cerebellar ataxiaacute cerebellar ataxia treatmentinherited cerebellar ataxiacerebellar ataxia curecerebral ataxia prognosisspinal cellular ataxiahereditary cerebellar atrophyprogressive cerebellar atrophyidiopathic cerebellar degenerationcerebellar degeneration syndromehereditary cerebellar degenerationcerebral ataxia treatment