Spot showed up on kidney. again. (wasnt reflux)

we had the test done for reflux--turns out thats not what it was like her Urologist thought.
we had a re-do ultra sound to make sure the picture wasnt just a bad one, and in in reality the spot was nothing.. but thats not the case either.

im waiting to hear from the doctor now, but im sure it will at least take a day so now im left worrying!

the only other two things the Urologist mentioned after he was dead set on the fact it was simply from reflux.. was cyst & cancer. She is almost 5 years old.. & never had any type of problems from her kidneys (they only did the test because it was routine for her upcoming surgery that was something completely different) So im not so much "worried" I just want to know what it is, and get it out.

Are there any other possibilities that you ladies know of?