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Division of Neurology (Drs. Fross, Martin, Stoessl, Burton, and Calne), Department of Medicine, the Department of Radmlogy (Dr. Lil, and the UBC/TRIUMF PET Program (Drs. Adam, Ruth, and Pate), University of British Columbia Faculty of Medicine, Health Sciences Centre Hospital, Vancouver, British Columbia, Canada.
Two patients with acquired dystonia were studied by computed imaging techniques and found to have lesions predominantly involving the putamen. The implications of these findings are discussed, and it is concluded that, for the genesis of dystonia, a relative increase of other inputs to the pallidum may be important, such as those from the caudate and subthalamic nuclei.
Address correspondence and reprint requests to Dr. Calne, Division of Neurology. Department of Medicine, University of British Columbia Faculty of Medicine, Health Sciences Centre Hospital, 2211 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 1W5.
Supported by the Dystonia Medical Research Foundation and the Medical Research Council of Canada.
Received June 5, 1986. Accepted for publication in final form October 13, 1986.
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