I'm 35. I had a biopsy on a thyroid lump last week. I've been reassured it's very likely benign. It has blood vessels and is part solid so they want to check.

During the pre-biopsy ultrasound, the doctor located loads of extra cysts. And then when looking at the large lump and suddenly went ''Oh gosh!' and flinched in his seat. He called the trainee Dr over to look at it, and started talking about it but I can't remember what he said. It was something about the borders and it practically disappearing into the thyroid tissue. He then took loads of screen shots :/

I asked after the scan what he thought and the The Dr reassured me again that it looks benign, and mentioned the blood vessels, saying nothing about the borders. They did the biopsy, left the room and someone else came in to shepherd me out. 

My brain is going a bit crazy. I keep reassuring myself that they would have conveyed any extra concerns to me... Right? So far the consultants have been very open about test results.