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Ventriculomegaly

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Ventriculomegaly is a brain condition that mainly occurs in the fetus when the lateral ventricles become dilated. The ventricular system of the brain develops from cerebral vesicles. In early brain development, the wide cerebral ventricles are surrounded by thin neural tissue. The final shape of the lateral ventricles is caused by the rapidly growing neocortex under the pressure of hemispheric rotation. The cerebral hemispheres curve backward and outward in early development. The frontal horns develop first, followed by the temporal horns, and finally the occipital horns.