Sporadic fetal brain disruption sequence

Fetal brain disruption sequence (FBDS) is an extremely rare condition in which a previously normally developing fetal brain suffers a destructive insult during gestation, leading to severe brain damage and a characteristic pattern of abnormalities at birth. The condition is classified as sporadic, meaning it occurs without a clear familial or genetic inheritance pattern. The underlying cause is thought to involve a vascular disruption, infection (such as congenital cytomegalovirus or Zika virus), or other insult that damages the developing brain tissue, leading to collapse of the fetal skull. The hallmark features of fetal brain disruption sequence include severe microcephaly (abnormally small head, ICD-10: Q02) with overlapping cranial sutures, prominent occipital bone, and scalp rugae (redundant, wrinkled scalp skin). The brain itself shows extensive destruction, often with large areas of encephalomalacia or porencephaly, and the cerebral hemispheres may be largely replaced by fluid-filled cavities. Neurological impairment is profound, and affected infants typically present with severe intellectual disability, seizures, spasticity, and failure to thrive. Other findings may include cortical visual impairment and feeding difficulties. There is no curative treatment for fetal brain disruption sequence. Management is supportive and symptomatic, focusing on seizure control with anticonvulsant medications, nutritional support (which may require gastrostomy tube feeding), physical therapy, and management of associated complications. The prognosis is generally very poor, with many affected infants experiencing significant morbidity and shortened life expectancy. Genetic counseling is recommended for families, though the recurrence risk is generally considered low given the sporadic and disruptive (non-genetic) nature of the condition in most cases.

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