This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
Agenesis of cerebellar vermis,large posterior fossa with megacisterna magna is a feature of 
Select and explain. 
A. Von Hippel-Lindau syndrome, B. Sturge weber syndrome, C. Chiari malformation, D. Dandy Walker malformation
D: Dandy Walker malformation
Answer: D: Dandy Walker malformation 
Explanation: Dandy-Walker Malformation is associated with agenesis of the cerebellar vermis, with the fouh ventricle communicating with cisterna manga producing Mega Cisterna Magna and a large Posterior Fossa. The Dandy-Walker continuum (DWC) is a spectrum of anomalies that includes Dandy-Walker malformation (DWM), vermian hypoplasia (VH),Blake pouch cyst (BPC), and mega cisterna magna (MCM).