I firmly believe that the mass that “disappeared “is going to show up on yet another scan. As long as it stays in a very small size range that is is the doctors and I all seem to be OK with continued active surveillance. If only other hand it starts to change size and or shape that’s a whole Nother matter. And I know that if I go through with surgery eventually, the odds are probably pretty good that the biopsy report is going to come back favorably but that doesn’t mean that it was a wasted surgery. My grandmother died of kidney cancer so my risk for that is a little bit higher. The fact that I already had breast cancer also makes it a little more likely although the original mass showed up about the same time the breast cancer did and that biopsy report on the kidney was negative. Well, the biopsy report on the breast cancer was highly positive. So it’s always a judgment. There is never a right or wrong answer . Everybody patients and doctors included do the best they can. I was happy that they shared with me the information that making the decision to have surgery or not have surgery, especially with a very small mass on a kidney is always totally a judgment. And it almost always would involve removing the entire kidney.