Regarding Dandy-Walker syndrome, all are seen except-: (A) Hydrocephalus, (B) Arachnoid cyst, (C) Posterior fossa cyst, (D) Cerebellar vermis deficiency
Answer is B. Dandy-walker malformation

The Dandy-Walker malformation consists of a cystic expansion of the 4th ventricle in the posterior fossa and midline cerebellar hypoplasia.
There is : -
Hydrocephalus (90% of cases)
Agenesis of the cerebellar vermis and corpus callosum.
The rapid increase in head size with prominent occiput.