Re: Question about thyroid scan and RAI
I don't believe thyroid cancer mutates into any other cancer. It rarely "metastisizes"---spreads beyond the thyroid, but if it does spread, pappillary would usually go to the neck (ie, lymph nodes, muscles near the thyroid). There have been members on here that actually found the follicular thyroid cancer because a rib broke, and it was biopsied and was thyroid cancer. Follicular could go to bone, and even more rarely, lungs.
Like I said, even if it does spread beyond the thyroid, it is usually destoyed with RAI. My surgeon said to me that statistically, people who get thyroid cancer outlive a sibling that did not have thyroid cancer. It is very curable, and you don't have to worry at this time about worst case scenarios, because statistically, it's just not a cancer that kills people.