My five year old son has an arachnoid cyst in the posterior fossa discovered after ct/mri for a concussion.  Recently he started having nosebleeds and headaches behind his ear above his neck along with some blurry vision.  Could the cyst be causing these symptoms?  We are waiting on a neurosurgery appointment.  Thank you!

Summarized question: What are the symptoms of arachnoid cyst?