Congenital hydrocephalus (often called water on the brain) that causes an accumulation of extra fluid in and around the brain. The extra fluid can cause the spaces in the brain, called ventricles, to become too large and the head can swell. Hydrocephalus needs to be followed closely and treated properly to prevent brain injury.
Source: Centers for Disease Control and Prevention
Birth Defect, Neuroanatomy
August 23, 2011