Opsoclonus-myoclonus syndrome

Opsoclonus-myoclonus syndrome, sometimes called dancing eyes syndrome, is an extremely rare condition thought to be immune-mediated, marked by chaotic eye movements and muscle jerks. Researchers believe an immune process disrupts structures in the brainstem and cerebellum involved in controlling eye movement, though the precise mechanism is not fully worked out. In children it is often linked to a tumor called neuroblastoma; in adults roughly half of cases are paraneoplastic, most commonly tied to small-cell lung cancer or breast cancer, while the other half are idiopathic and often follow an infection.

The condition is considered exceptionally rare, with research estimating an incidence around 0.2 cases per million children per year and adult incidence lower still. Because it is so uncommon, diagnosis can be difficult and is often made after other causes have been ruled out.

Common signs

Rapid, disorganized eye movements in all directions (opsoclonus), brief muscle jerks (myoclonus), unsteadiness and poor coordination (ataxia), irritability or behavior changes, and sleep problems.

This is a plain-language summary for orientation, not a diagnosis. Mechanisms are described as current understanding, not settled fact. Work with your own clinician for your care.