You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Agenesis of cerebellar vermis,large posterior fossa with megacisterna magna is a feature of and explain in detail?
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).