What is Hydrocephalus?

Hydrocephalus is a rare condition also known as water on the brain. It results from an excessive build up of cerebrospinal fluid, a watery substance which surrounds the brain and spinal cord. The surplus fluid collects in cavities in the brain, generally resulting in an abnormally enlarged head. The condition usually develops after birth, but is also known to affect the unborn child, in which case a Caesarean section is needed to deliver the baby.