Abstract
Among 27 preclinical carriers of the Huntington disease mutation (PMC), the authors found normal striatal values for MRI volumetry in 88% and for fluorodesoxyglucose PET metabolic index in 67%. Raclopride PET binding potential (RAC-BP) was decreased in 50% and correlated with increases in the product of age and CAG repeat length (p < 0.0005). Dopamine D2 receptor availability measured by RAC-BP seems the most sensitive indicator of early neuronal impairment in PMC.
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