We actually removed a lot of these when I worked at the kids hossy in Sydney. Well not a lot, but they weren't rare IYKWIM?...and I worked with kidneys a lot. They'll usually shrink it with radio or chemo first and then take her to surgery to take it out. Sometimes they do have to take the whole kidney but not often. They have a capsule that can usually be removed on it's own from memory. It's pretty major surgery for a sick kid and she would have a drain for a bit afterwards....can't really remember much else though.

She's in the right spot though.