Sporadic infantile bilateral striatal necrosis

Sporadic infantile bilateral striatal necrosis (IBSN) is a rare neurological disorder characterized by progressive degeneration (necrosis) of the striatum, which includes the caudate nucleus and putamen — key structures of the basal ganglia in the brain. Unlike familial forms of bilateral striatal necrosis, this condition occurs sporadically, meaning it arises without a clear inherited genetic pattern. The disease typically presents in infancy and primarily affects the central nervous system, leading to progressive movement abnormalities and developmental regression. Key clinical features include progressive dystonia (sustained involuntary muscle contractions causing abnormal postures), choreoathetosis (involuntary writhing and jerky movements), spasticity, and developmental delay or regression of previously acquired motor and cognitive milestones. Affected infants may also experience dysphagia (difficulty swallowing), dysarthria (difficulty with speech), and in some cases, episodes of acute neurological deterioration that may be triggered by febrile illness. Brain MRI characteristically reveals bilateral symmetric lesions in the caudate nuclei and putamina, often with signal changes indicating necrosis. The underlying cause of the sporadic form remains largely unknown, though some cases may involve mitochondrial dysfunction, infectious triggers, or other metabolic disturbances. There is currently no curative treatment for sporadic infantile bilateral striatal necrosis. Management is supportive and symptomatic, focusing on physical therapy, management of dystonia and spasticity with medications such as baclofen or benzodiazepines, nutritional support, and rehabilitation services. The prognosis is variable, with some children experiencing a static course after initial deterioration while others may have progressive neurological decline.

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