This article includes Supplementary Video, available online at .

jws-mds.20529.mpg12831K Examination of this 50-year-old woman found widespread chorea, dysarthria, jerky pursuit, hypometric saccades, and a wide-based gait. Apraxia demonstrated here is different from what one might have expected in a patient with Huntington's disease. This video presentation has been abbreviated. The full version will appear on theMovementDisorders DVD Supplement, which is issued bi-annually.

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.