Which of the following statements about Dandy-Walker syndrome are true and which are false? 1 Most common posterior fossa malformation 2 Consists of a cystic expansion of 4th ventricle in the posterior fossa & midline cerebellar hypoplasia 3 Triad of Hypoplasia of vermis + Cephalad rotation of the vermian remnant & cystic dilatation of 4th ventricle extending posteriorly + Small posterior fossa 4 Most common manifestation is Macrocephaly 5 Managed by shunting the cystic cavity