I had a breast needle core biopsy based on a spot on my mammogram - which was done during that time of the month - and my history (BC). Came back negative. Surgeon still wanted to make sure, so I was scheduled for an excisional biopsy, where they take out the whole area of the spot and biopsy it. Radiologist at the hospital couldn't find the spot. Gone. When he looked at the original films he said he never would've done a biopsy based on that finding; he would have repeated and waited and watched, etc. We still watched it, and it never returned. He thought it was just fluid. Things can come and go in the body based on what's going on at the time. It doesn't mean they shouldn't be watched, but it also doesn't mean we should necessarily do all kinds of invasive procedures on them right away, either.
Absolutely, as there can be a whole separate host of complications with the invasive procedures themselves. Glad your spot disappeared