Dear Jose:
Sorry to hear about your son. No, I would not place a shunt in your son now. Only about 15-20% of infants with full Dandy-Walker will develop hydrocephalus. So, the odds are in your sons favor of never developing hydrocephalus. I would make sure that cognitive function is followed closely as there is an association between neuronal migration disorder and the Dandy Walker malformation (chance for learning problems). Since the vermis is involved, there is also a chance for body stability problems, but I am sure that your pediatrician has already talked to you about these things. I hope your son will do well.
Sincerely,
CCF Neuro MD