My Neurologist at Mayo scheduled me for a Sural nerve biopsy, which was a minor surgery in which they removed a section of the sural nerve in my left leg. This was to determine the extent of damage to my nerves. Before the surgery, the surgeon informed me that the left side of my left foot would always be numb no matter if any treatments cured the rest of my CIDP. I agreed to surgery because I wanted to know for sure what kind of damage was already done to my nerves. My condition is a combination of Anti-mag peripheral neuropathy and CIDP. I wouldn't hesitate getting the surgery again, but of course that nerve is already gone in my left leg!