Dandy-Walker syndrome is a rare neurological disorder that affects the development of the brain. While the condition is primarily referred to as Dandy-Walker syndrome, it is also known by other names. These synonyms for Dandy-Walker syndrome include Dandy-Walker malformation, Dandy-Walker complex, Dandy-Walker variant, and Dandy-Walker cyst. The disorder is characterized by a cyst that forms in the back of the brain, leading to an enlargement of the fourth ventricle. This can cause symptoms such as headaches, vomiting, and developmental delays in infants. Treatment options for Dandy-Walker syndrome include surgery to remove the cyst or the use of shunts to help drain excess fluid from the brain.