Hello!
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WOW!! That's one huge kidney stone that your Grandmother has. To be very honest with you, I have nothing in my over 30 years and 35 plus stones experience that would qualify me to comment on her situation in anyway. Considering her other medical procedures and that 70 mm kidney stone that she now has, the only thing that I would possibly suggest is a third opinion, just to be sure. It would seem to me though, as a layman, that someone needs to remove a stone that size ASAP and the sooner,the better for her general health and in order to give her a better chance of keeping that one kidney. Please let us know what happens and how your Grandmother makes out with this situation.