Who have you see for the Chiari diagnosis? Unfortunately there’s no consensus with how a styloidectomy & C1 shave affects CCI, doctors don’t agree and experiences from members vary too… I don’t think that any ligaments are detached with a C1 shave, here’s one discussion:
C1 shave- Lateral Altanto Occipital Ligament - Welcome / New User Help - Living with Eagle
You could raise your worries with Dr Costantino, and ask for the minimum to be removed to make space for the IJV… Do you have a date for your surgery?
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