Cancer can only be confirmed by biopsy. None of the diagnostic tests are 100% accurate, except FNAB, which is very close. They are probably right, based on CT, MRI, experience, but I would like to get a 2nd opinion, if I could, to proceed further. Why can't they do a biopsy, under anesthesia, on the nasopharyngeal wall? 10 days radiation? Type of radiation? Surgery? Alternative treatment? It takes over 50Grays to kill SCC, certain areas lower due to max toxicity levels, previous radiation, and the optic nerve probably has a lower toxicity level, maybe nasopharyngeal wall also. Sometimes for reiirdation in certain area they do a flap. No chemo planned as a radio sensitizer? This is really the best shot for a cure now to avoid another rcurrence. My last recurrence, my 5th, my consulting RO said 50Gy IMRT would not work, so I left my treatment center, had a different treatment at his institution.

Good luck with everything.