<prompt> Not true regarding Dandy Walker cyst ?Cerebellar Vermis hypoplasiaHydrocephalusArachnoid CystPosterior fossa cyst  <response>: Ans is c ie Arachnoid cyst The Dandy-Walker malformation consist of a cystic expansion of the fouh ventricle in the posterior fossa, which results from a development failure of the roof of the 4th ventricle during embryogenesis. Approximately 90 of pts. have hydrocephalus A significant number of children have associated anomalies including agenesis of the posterior cerebellar vermis and corpus callosum - Nelson 