Newborn with a prenatal diagnosis of hydrocephalus, status post VP shunt placement

CT of over-shunting
Initial axial CT without contrast of the brain (above) showed marked dilation of the lateral, third and fourth ventricles. Axial CT without contrast of the brain 1 day after shunt placement (below) shows interval decompression of the ventricular system and interval development of large bilateral subdural hygromas.

The diagnosis was subdural hygroma development due to over-shunting.