Segmental myoclonus arising in the spinal cord occurs with several viral infections, including herpes zoster radiculitis. Usually, abnormal movements follow the rash and require drug treatment to suppress. We report a patient with AIDS in whom arm and shoulder myoclonus preceded herpes zoster involving the same segments contralaterally on two occasions. Myoclonus remitted promptly with antiviral treatment. Unlike in other immunosuppressed patients, encephalitis did not occur after the second episode.
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