Congenital communicating hydrocephalus

Congenital communicating hydrocephalus is a rare neurological condition present at birth in which cerebrospinal fluid (CSF) accumulates within the ventricles of the brain despite the absence of an obstruction in the ventricular system. In communicating hydrocephalus, CSF can flow freely between the ventricles but is inadequately absorbed at the arachnoid granulations or, less commonly, is overproduced. This leads to progressive enlargement of the ventricles and increased intracranial pressure. The condition primarily affects the central nervous system and can impact brain development if left untreated. Key clinical features include an abnormally enlarged head circumference (macrocephaly) at birth or in early infancy, a bulging fontanelle, irritability, poor feeding, vomiting, downward deviation of the eyes ("sunsetting" sign), and developmental delays. In severe cases, seizures and progressive neurological deterioration may occur. The diagnosis is typically made through prenatal ultrasound or postnatal neuroimaging such as cranial ultrasound, CT, or MRI, which reveal ventriculomegaly without evidence of obstruction. Treatment is primarily surgical. The most common intervention is the placement of a ventriculoperitoneal (VP) shunt, which diverts excess CSF from the brain ventricles to the peritoneal cavity for absorption. Endoscopic third ventriculostomy (ETV) may be considered in select cases, though its efficacy in communicating hydrocephalus is more limited compared to obstructive forms. Long-term outcomes depend on the severity of the condition, the presence of associated brain abnormalities, and the timeliness of treatment. Many patients require lifelong monitoring for shunt complications, including malfunction, infection, or over-drainage. Early intervention can significantly improve neurodevelopmental outcomes, though some degree of cognitive or motor impairment may persist.

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