Symptoms I had to watch for and that were misdiagnosed in my mother are: numbness, tingling, weakness. We found mine because I held my head to one side, and we asked orthopedist about it, because when I got to jr high people kept asking me why My head was crooked, idk so I asked my mom. She looked back at all my pictures to when I was a baby and we found I’d held it that way all the way back. Also short necks, low hairline in back are 2 visible outside the body.