Hard decision, but I think if there's even a small chance with cancer to seriously think about your thyroid being removed.
However, if you do .. you need to have a skilled surgeon. Why? Because of your parathyroids on the back side of the thyroid. They do some serious work and if damaged in any from surgery (which happens a bit .. why you need to make sure you have a surgeon who knows what he or she is doing LOL). Hypoparathyroid which controls your calcium and phospherous levels. If one of the 4 parathyroids on the back of they thyroid is damaged then you're in trouble LOL. It's treatable but it can be deadly to if not controlled.
Just something to consider and talk with the doctor and surgeon about and if they know about it, then it should go well :)
Other than that, I'd probably say go for it ..
Hi All my tests were negative. But the goiter did get bigger in one year. When I did go for surgery it was wrapped around my nerve which can choke you. I told the surgeon to only remove goiter. Then after they sent tissue sample they found two little dots of cancer. So I went back to have the whole thyroid removed. This was last year. I was very tired my hair fell out in handfuls. I did gain some weight 5-8 lbs. I just switched from synthroid to Nature throid still feeling tired. The medication did not make me sick, in fact the synthroid gives you a wired feeling and keeps you from good nights sleep. Hope this helps!