Dandy walker variant By Dr.Pavan Kumar In CNS Posted September 19, 2018 AXIAL CT AXIAL CT Patient History : 22 yr male with recurrent seizures & mental retardation, Gender:Not specifiedAge:22 Dandy Walker variantDandy-Walker variant consist of vermian hypoplasia and cystic dilatation of the fourth ventricle without enlargement of the posterior fossa