sporadic adult-onset ataxia of unknown etiology https://github.com/monarch-initiative/mondo/issues/6752 https://www.malacards.org/card/sporadic_adult_onset_ataxia_of_unknown_etiology Orphanet:247234 MONDO:0016591 SCTID:734023003 Sporadic adult-onset ataxia of unknown etiology describes a group of non-hereditary degenerative ataxias characterized by a slowly progressive cerebellar syndrome (with ataxia of stance and gait, upper limb dysmetria and intention tremor, ataxic speech, and oculomotor abnormalities), presenting in adulthood (at around 50 years of age), that is not due to a known cause. Extracerebellar symptoms (e.g., decreased vibration sense and absent or decreased ankle reflexes), polyneuropathy and mild autonomic dysfunction may also be present. Mild cognitive impairment has also rarely been reported. SAOA idiopathic late-onset cerebellar ataxia GARD:0020654 UMLS:C4518339 MEDGEN:1383968 acquired ataxia