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Dopamine-responsive dystonia also known as Segawa syndrome , is a genetic movement disorder which usually manifests itself during early childhood at around ages 5–8 years.
Characteristic symptoms are increased muscle tone and Parkinsonian features, typically absent in the morning or after rest but worsening during the day and with exertion. Children with dopamine-responsive dystonia are often misdiagnosed as having cerebral palsy. The disorder responds well to treatment with levodopa.
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