I do understand that you had a thyroid cancer
and your followup has been normal. I presume you were given radioactive iodine
Your concern seems to be related to lymph
node. Lymph node enlargement may not always signify malignancy and could be due to various reason. In your case as new lymph nodes are seen, i would prefer to have an excision biopsy
to decide the nature of the lymph node and plan treatment accordingly.