CT - Huntington's disease: A 59-year-old long-term female resident of a local psychiatric center was referred for involuntary jerking movements. Examination revealed oculomotor apraxia, dementia and diffuse chorea. This CT scan without contrast demonstrates bilateral caudate atrophy, with loss of the usual protrusion of the head of the caudate into the lateral aspect of each lateral ventricle. Her clinical and x-ray features are strongly suggestive of Huntington's disease, an autosomal dominant disorder characterized by psychiatric illness, dementia and chorea.