<prompt> All of the following are true about Dandy Walker malformation EXCEPT?It is due to the failure of opening of foramen of Magendie4th ventricle forms a cyst in the posterior fossaCerebellum remains normalDelayed development and spasticity may be seen.  <response>: Dandy Walker malformation: It is dt failure of opening of foramen of Magendie Results in balooning of posterior wall of 4th ventricle to form a cyst in posterior fossa. Associated with other cerebral cerebellar anomalies . - Clinical features : Delayed development, spasticity and cerebellar ataxia. 