Isolated bilateral hemispheric cerebellar hypoplasia

Isolated bilateral hemispheric cerebellar hypoplasia is an extremely rare congenital brain malformation characterized by underdevelopment (hypoplasia) of both cerebellar hemispheres, without significant involvement of the cerebellar vermis and without other major associated brain or systemic anomalies. The cerebellum is the part of the brain responsible for coordinating movement, balance, and fine motor control, and its underdevelopment leads to a range of neurological difficulties. Affected individuals typically present in infancy or early childhood with motor developmental delay, hypotonia (reduced muscle tone), ataxia (impaired coordination and balance), and difficulties with fine motor skills. Speech and language development may also be delayed. Cognitive function can range from normal to mildly impaired depending on the severity of the cerebellar hypoplasia. The condition is distinguished from other cerebellar malformations by the selective involvement of the cerebellar hemispheres bilaterally, with relative sparing of the vermis and absence of other structural brain abnormalities. The underlying genetic causes remain incompletely understood, and both genetic and non-genetic etiologies have been proposed. There is currently no curative treatment for isolated bilateral hemispheric cerebellar hypoplasia. Management is supportive and multidisciplinary, focusing on physical therapy, occupational therapy, and speech-language therapy to optimize motor function and developmental outcomes. Regular neurological follow-up is recommended to monitor progression and address emerging needs.

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