I had one big one, was scared about it. Before I could even get in to see the endocrinologist it was nothing but a stub. The doc said thyroid cancer is rare and that for it to develop from a cyst is .05% possible. I was relieved but also I didn't speak it into my life so I wasn't worried. Don't talk yourself into anything stupid. If you see in a sonogram a black spot in the lump it's fluid.