Hi.., The effect of Dandy-Walker Syndrome on intellectual development is variable, with some children having normal cognition and others never achieving normal intellectual development even when the excess fluid buildup is treated early and correctly. Longevity depends on the severity of the syndrome and associated malformations. The presence of multiple congenital defects may shorten life span... Treatment for individuals with Dandy-Walker Syndrome generally consists of treating the associated problems, if needed. A surgical procedure called a shunt may be required to drain off excess fluid within the brain. This will reduce intracranial pressure and help control swelling.