Cranial meningocele

Cranial meningocele is a type of neural tube defect (NTD) in which the meninges (the protective membranes surrounding the brain) protrude through a defect in the skull bones, forming a sac filled with cerebrospinal fluid. Unlike encephalocele, cranial meningocele does not contain brain tissue within the herniated sac. The condition is present at birth and results from incomplete closure of the cranial portion of the neural tube during early embryonic development. Cranial meningoceles can occur at various locations on the skull, including the occipital (back of the head), frontal, or parietal regions, corresponding to the different ICD-10 subcategories (Q01.0 for frontal, Q01.1 for nasofrontal, Q01.2 for occipital, and Q01.8/Q01.9 for other or unspecified sites). Clinical presentation varies depending on the size and location of the defect. Patients may present with a visible soft tissue mass on the head that may be covered by skin or a thin membrane. Key symptoms can include a palpable skull defect, potential cerebrospinal fluid leakage, and risk of meningitis. In uncomplicated cases where no brain tissue is involved, neurological outcomes are generally more favorable than in encephalocele. However, some patients may experience hydrocephalus, seizures, or developmental delays depending on associated anomalies. Treatment is primarily surgical, involving repair of the meningeal herniation and closure of the skull defect. Surgical correction is typically performed in the neonatal or early infantile period to reduce the risk of infection and further complications. Prognosis after surgical repair of an isolated cranial meningocele is generally good, with many patients achieving normal or near-normal neurodevelopmental outcomes. Multidisciplinary follow-up involving neurosurgery, neurology, and developmental pediatrics is recommended. Folic acid supplementation before and during early pregnancy has been shown to reduce the overall risk of neural tube defects, including cranial meningocele.

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