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Treatment-refractory paraneoplastic opsoclonus–myoclonus syndrome in a patient with small-cell carcinoma of the lung

Opsoclonus–myoclonus syndrome is a rare disease and traditionally described as “dancing eyes, dancing feet syndrome.” It is characterized by opsoclonus (oscillations of the eyes in either horizontally or vertically) and myoclonus (spontaneous jerky movements of the limbs and trunk). There are numerous etiological factors defined such as paraneoplastic, para-infectious, toxic-metabolic, and idiopathic causes. The experience of opsoclonus–myoclonus syndrome in adults is very limited. Here, we present a case of treatment-refractory paraneoplastic opsoclonus–myoclonus syndrome associated with small-cell carcinoma of the lung.