Hello Cary and welcome! I am assuming you have been diagnosed with CM? What decompression is, is Posterior Fossa Decompression or PFD. What that means is that they make more room for your brain by removing part of the skull at this area at the back of head craniocervical junction. Sometimes they will remove the top cervical vertebrae(s)(laminectomy) and open the covering of the brain(dura) and sew in a patch to make more room there. That patch can come from several different sources.
This is the only treatment for Chiari and everyone is not a surgical candidate. It is determined by blockage of csf fluid, whether or not there is a syrinx, and your symptoms, the degree they are affecting your life.
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