Foramen Magnum Decompression (FMD) is a surgical procedure used to treat Chiari malformation, a condition where the lower part of the brain extends into the spinal canal. This video explains how FMD creates more space at the base of the skull to relieve pressure and restore normal cerebrospinal fluid flow. We walk you through the entire process, fasting before surgery, receiving general anesthesia, and how surgeons carefully remove a small portion of the skull base and upper spine to reduce comp