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IntroductionAlthough transcranial sonography (TCS) assessing hyperechogenic substantia nigra (SN+) as biomarker for Parkinsońs disease (PD) has been introduced elsewhere, the clinical relevance and accuracy in a Swedish population is still unknown.MethodsThis retrospective single-center study included 74 patients with predominantly early-stage parkinsonism at first visit who had been examined by T
