I had Arnold Chiari Malformation type 1, I had the decompression surgery on November 6, 2012 ... During surgery my muscles in my head began to tare and my surgeon had to cut them, this has been the most difficult part of recovery for me. My headaches are gone, however I do tire more easily.. I'm really glad I had it done... My head feels numb sometimes and I do have a headache now and then, but nothing like before the surgery...I was able to return to work 5 weeks to the day mysurgery was done.. I still am healing and its been just over a year, it's bittersweet.... I would do it all over again , it really helped...