Aprosencephaly cerebellar dysgenesis

Aprosencephaly with cerebellar dysgenesis is an extremely rare and severe congenital brain malformation characterized by the near-complete absence of the forebrain (prosencephalon) combined with abnormal development of the cerebellum. This condition represents one of the most severe forms of brain maldevelopment, considered even more severe than alobar holoprosencephaly. Affected infants typically present with profound neurological impairment, absence of recognizable cerebral hemispheres, and significant cerebellar abnormalities. Craniofacial anomalies are commonly associated, including microcephaly, facial dysmorphism, and features overlapping with the holoprosencephaly spectrum such as cyclopia, proboscis, or other midline facial defects. The condition affects the central nervous system primarily, with devastating consequences for brain structure and function. Key clinical features include severe intellectual disability, absence of voluntary movement, seizures, and failure to thrive. Affected neonates typically have a very poor prognosis, with most cases being lethal in the neonatal period or early infancy. Additional malformations involving other organ systems, including the eyes and skeletal system, may also be present. There is currently no curative treatment for aprosencephaly with cerebellar dysgenesis. Management is supportive and palliative, focusing on comfort care and addressing immediate medical needs such as feeding difficulties and seizure management. Genetic counseling is recommended for affected families. Some cases have been reported in siblings, suggesting a possible autosomal recessive inheritance pattern, though the genetic basis remains incompletely understood.

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