Thalamic hand dystonia: an MRI anatomoclinical study.

Focal dystonia has been attributed to lesions involving the basal ganglia and/or thalamus. Hand dystonia was studied in a patient with a unilateral thalamic infarction documented by MRI. A 18-year-old girl presented with severe isolated dystonia of the right hand as a sequel of perinatal infarction. MRI scan revealed infarction affecting part of the dorsomedian, lateral posterior, ventral lateral, ventral posterior lateral nuclei, and centromedian-parafascicular nucleus of the contralateral thalamus. The unique MRI anatomoclinical presentation of this case, taken together with the literature data, could provide evidence that a lesion affecting one or several thalamic nuclei, including the centromedian nucleus, can induce hand dystonia.