Hi: I had papillary thyroid cancer , which spread to my scalp, lungs and around the esophagus . Had surgery to have thyroid removed and nodule removed from scalp in August, 2012. Had radioactive iodine in September, 2012. If iodine doesn t work for piece around esophagus, dr. talking possibly doing radiation beam treatment. Is it possible cyberknife could be an option instead of that?