disease shares features of syndromic disease ataxia telangiectasia ataxia - telangiectasia variant https://github.com/monarch-initiative/mondo/issues/6752 https://github.com/monarch-initiative/mondo/issues/6877 GARD:0021597 MEDGEN:406286 v-AT MONDO:0018266 Ataxia-telangiectasia variant is a rare, genetic, persistent combined dystonia characterized by clinical signs similar to ataxia-telangiectasia but with a later (usually adulthood) onset and slower progression. Patients typically present extrapyramidal signs, such as resting tremor, choreathetosis, and dystonia, as the initial symptoms and later often develop mild cerebellar ataxia (with gait usually preserved). Telangiectasia and immunodeficiency may be absent but secondary features of ataxia-telangiectasia, such as risk of malignancy, dysarthria and peripheral neuropathy, are frequently present. UMLS:C1876175 Orphanet:370109 combined dystonia