Segawa syndrome is associated with heterogeneous phenotypes, encompassing symptoms such as generalized dystonia, rigidity, tremors, infantile parkinsonism, pseudo-spastic paraplegia, and progressive infantile encephalopathy.
The severity of symptoms varies among individuals and can be classified into two types based on the neurological features: Type A, onset in infancy or early childhood, characterized by mild, progressive hypokinetic-rigid syndrome with dystonia, typically recovering well with L-dopa treatment, and Type B, which manifests in neonates with a complex encephalopathy, severe symptoms, and a moderate or poor response to L-dopa treatment. Notably, the syndrome predominantly affects females, and females often present with more severe symptoms than males.
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