La Revue de médecine interne
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Opsoclonus-myoclonus syndrome is a rare disorder. We report a 44-year-old patient with opsoclonus associated with a cerebellar syndrome revealing a small cell lung carcinoma. The treatment with chemotherapy initially improved the clinical symptoms but these eventually recurred. ⋯ When it is associated with other manifestations of the central nervous system (head myoclonus and ataxia), it constitutes a clinical picture known as opsoclonus-myoclonus syndrome. In adults, the most frequent causes are post-infectious, paraneoplastic and idiopathic. The symptomatic treatment is not defined, but the treatment of the underlying cause may improve the clinical features of this syndrome.