Hereditary Essential Myoclonus

Abstract
A new family with the rare condition of hereditary essential myoclonus (HEM) and the literature on HEM are presented. Some of these cases may previously have been reported under the title of Friedreich’s paramyoclonus multiplex. The present family, which is number 13 in the literature and in which 9 members in three generations had this benign disorder, is described. The diagnostic criteria have been tabulated.

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