An atypical clinical course of a 71-year-old man with right arm weakness and ataxia


      • 71-year-old simplex case with a diagnostically challenging neurological disorder.
      • Complex course with phenotypic overlap between MSA-C and spinocerebellar ataxias.
      • Investigation excluded MSA-C while clinical signs of SCA3 prompted genetic testing.
      • SCA3, presenting with an atypical course, was confirmed by genetic tests.
      • Test results discordant with the clinical course warrant cautious interpretation.
      • Lack of family history should not deter genetic testing in ataxic disorders.



      Multiple System Atrophy (MSA), Spinocerebellar ataxia (SCA)
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