Surgical History Undergone Any Type of Chiari Related Surgery Sugery Only: Undergone a Chiari/Posterior Fossa Decompression Decompression Surgery Only: Number of Decompression Surgeries Surgery Only: Other Procedures (Selected All That Applied) Surgery Only: Total Number of Chiari Related Surgeries Surgery Only: Overall Impact on Symptoms (Outcome) If You Knew Before Surgery How You Feel Now, Would You Go Through With It Again?