Opsoclonus–myoclonus syndrome (OMS) is a rare condition that has been reported from all parts of the world. It is well recognized as a paraneoplastic syndrome in children with neuroblastoma and in adults with small-cell carcinoma of lung and some other cancers. It may also occur in association with various central nervous system infections. We report a case of OMS in a patient with varicella zoster virus infection. IgM antibody for varicella-zoster virus was detected in the serum and the cerebrospinal fluid. The patient improved after treatment with clonazepam and was asymptomatic at 1-month follow-up.
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