<s>[INST] 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? [/INST] hi, yes chemotherapy has got very limited role in thyroid carcinoma and radiation therapy works in few cases. Cyber knife can be a good option when the nodules are limited and at critical points which are not operable. in your case, I feel it should  help you. few areas can be covered by cyber knife and other areas can be covered by conventional radiotherapy. Take care. </s>