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Surgeries on tumors under the ear (deeper ones) will always have the risk of damaging the nerve
. The percentage of risk depends on the size of the tumor, relationship with the nerve, degree of infiltration of the local tissues and also skill of the surgeon. But I believe that many surgeons would be equipped to do it. Consult an oncosurgeon and he should help you out. Don't lose hope.
Hope that encourages you.
God bless you
Dr Anand Sinha