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Specific binding in the striatum was significantly reduced in the multiple system atrophy patients as compared with the normal control group, with average reductions of 61% in the caudate nucleus (<jats:italic>p<\/jats:italic> = 0.002) and 58% in the putamen (<jats:italic>p<\/jats:italic> = 0.009). Smaller reductions were found in the sporadic olivopontocerebellar atrophy group, averaging 26% in the caudate nucleus (<jats:italic>p<\/jats:italic> = 0.05) and 24% in the putamen (<jats:italic>p<\/jats:italic> = 0.11).Mean blood\u2010to\u2010brain [<jats:sup>11<\/jats:sup>C]dihydrotetrabenazine transport (K<jats:sub>1<\/jats:sub>) was significantly different between groups only in the cerebellum, with values for the sporadic olivopontocerebellar atrophy group diminished compared with the normal control group. Cerebellar K<jats:sub>1<\/jats:sub> was not significantly decreased in the multiple system atrophy group. The finding of reduced striatal WT2 in sporadic olivopontocerebellar atrophy patients suggests nigrostriatal pathology, indicating that some may later develop symptomatic extrapyramidal disease.<\/jats:p>","DOI":"10.1002\/ana.410400610","type":"journal-article","created":{"date-parts":[[2005,1,1]],"date-time":"2005-01-01T14:53:19Z","timestamp":1104591199000},"page":"885-892","source":"Crossref","is-referenced-by-count":52,"title":["Decreased striatal monoaminergic terminals in olivopontocerebellar atrophy and multiple system atrophy demonstrated with positron emission 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