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Colorado Fetal Care Center


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What is ventriculomegaly?

Ventriculomegaly occurs when the fluid-filled spaces (ventricles) in a baby’s brain measure larger than they should. Usually, this happens because the ventricles contain extra cerebrospinal fluid (CSF), the protective liquid that surrounds the brain and spinal cord.

Ventriculomegaly may require surgical treatment if it leads to hydrocephalus, a significant buildup of CSF that causes increased pressure in the brain. Without treatment to drain the fluid and relieve pressure, hydrocephalus may cause short-term and long-term problems.

What causes ventriculomegaly?

Ventriculomegaly can develop early in pregnancy while a baby is developing. There are many potential causes of ventriculomegaly, but sometimes doctors can’t determine the exact cause. Some known causes of ventriculomegaly during pregnancy include:

  • Imbalances with CSF fluid circulation and absorption
  • Differences with brain development in the growing fetus
  • Fetal infections
  • Genetic differences
  • Other fetal structural differences

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