Dandy Walker Syndrome is a congenital brain malformation involving the cerebellum and the fluid filled spaces around it. This syndrome involves an enlarged fourth ventricle (a channel that allows fluid to flow freely between upper and lower areas of the brain and spinal cord), a partial or complete absence of the cerebellar vermis (the area between the two cerebellar hemispheres), and cyst formation near the internal base of the skull. There can also be an increase in the fluid space sizes surrounding the brain, known as hydrocephalus. (information found at http://dandy-walker.org/).
|Photo retrieved from here|