Additional surgery is a possibility. Sometimes the Teflon padding used in the MVD can move, or there could be additional veins or blood vessels compressing the nerve. But these scenarios tend to be rare.
The best thing is to go to your doctor. Sometimes going back on a low dose of medication for a few months will be enough to calm the nerve down. Talk to your neurosurgeon.
The main thing is to get the pain controlled via medication so that you can discuss alternatives with the doctors and decide what's best for you.
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