Although the patient's vital signs were normal, he had an irregularly irregular heartbeat. He recalled none of 3 objects after several minutes of distraction, and he had an anomic aphasia. He had a depressed mood and flattened affect, and he frequently exhibited pseudobulbar crying. When asked, he denied that he was sad on these occasions. Cranial nerve examination results were normal with the exception of an incongruous right homonymous hemianopia, saccadic breakdown of ocular smooth pursuit movements, and a mild right supranuclear palsy of the seventh cranial nerve. During a motor examination, there was facilitatory paratonia in the right upper and lower extremities, a mild right hemiparesis (4/5 in the deltoid, distal upper extremity muscles, and hip flexors), and pronation drift of the right upper extremity. At rest he exhibited frequent, irregular, high-amplitude ballistic movements of his proximal right upper extremity. Adventitious movements of the right lower extremity were of much lower amplitude. These movements were worse during intentional activity, including finger-to-chin and toe-to-target maneuvers and ambulation. He also had mild, nearly continuous choreiform movements of the right upper and lower extremities, both at rest and with intentional activity, that were present between the episodes of ballistic movement. There was mild, symmetric impairment in all sensory modalities extending to the ankles, and there was a decrease in pinprick and temperature sensation in the right upper and lower extremities. Cerebellar function was intact. Reflexes were slightly more brisk on the right, and plantar responses were equivocal.