Hyperekplexia Exacerbated by Occlusion of Posterior Thalamic Arteries

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Abstract
• A 65-year-old man with the onset of hyperekplexia at 37 years of age experienced resolution of the illness at the age of 45 years. Twenty years later after a posterior thalamoperforate artery occlusion that produced a "rubral tremor," severe hyperekplexia redeveloped. The patient's symptoms were controlled with clonazepam, except for brief periods. Interruption of the rubrothalamic pathways or neuronal aggregates at the level of the red nucleus seemed to disinhibit the startle reflex.

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