Why Does It Happen (Continued)

Brain Haemorrhage

Other forms of brain haemorrhage, including those occurring in adults ("stroke") can result in this type of post-haemorrhagic Hydrocephalus.

Meningitis

This is an infection of the membranes covering the brain.  The inflammation and debris from this infection block the drainage pathways resulting in Hydrocephalus. Meningitis can occur at any age, but it is more common in children.   The incidence of one form, haemophilus meningitis, has been drastically reduced by HIB vaccine.

Dandy Walker Cysts

There is a particular group of disorders involving the formation of fluid-filled cysts in the CSF system (for example, Dandy Walker cysts).  In these cases, Hydrocephalus is often due to pressure on the surrounding tissues by the enlarging cyst.