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Although widely employed in diagnosing various movement disorders, such as Parkinson's disease and dystonia, by detecting disease\u2010specific abnormalities, the specific characteristics of the TCS in cerebellar ataxia remain inconclusive. We aimed to assess the potential value of TCS in patients with cerebellar ataxias for disease diagnosis and severity assessment.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>TCS on patients with genetic and acquired cerebellar ataxia, including 94 with spinocerebellar ataxias (SCAs) containing 10 asymptomatic carriers, 95 with cerebellar subtype of multiple system atrophy (MSA\u2010C), and 100 healthy controls (HC), was conducted. Assessments included third ventricle width, substantia nigra (SN) and lentiform nucleus (LN) echogenicity, along with comprehensive clinical evaluations and genetic testing.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The study revealed significant TCS abnormalities in patients with cerebellar ataxia, such as enlarged third ventricle widths and elevated rates of hyperechogenic SN and LN. TCS showed high accuracy in distinguishing patients with SCA or MSA\u2010C from HC, with an AUC of 0.870 and 0.931, respectively. TCS abnormalities aided in identifying asymptomatic SCA carriers, effectively differentiating them from HC, with an AUC of 0.725. Furthermore, third ventricle width was significantly correlated with SARA and ICARS scores in patients with SCA3 and SCOPA\u2010AUT scores in patients with MSA\u2010C. The SN area and SARA or ICARS scores in patients with SCA3 were also positively correlated.<\/jats:p><\/jats:sec><jats:sec><jats:title>Interpretation<\/jats:title><jats:p>Our findings illustrate remarkable TCS abnormalities in patients with cerebellar ataxia, serving as potential biomarkers for clinical diagnosis and progression assessment.<\/jats:p><\/jats:sec>","DOI":"10.1002\/acn3.52131","type":"journal-article","created":{"date-parts":[[2024,6,25]],"date-time":"2024-06-25T06:07:42Z","timestamp":1719295662000},"page":"2100-2111","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["The characteristic and biomarker value of transcranial sonography in cerebellar ataxia"],"prefix":"10.1002","volume":"11","author":[{"given":"Sudan","family":"Zhu","sequence":"first","affiliation":[{"name":"Department of Neurology, Xiangya Hospital Central South University  Changsha 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