Just found out why a lone kidney grows when the partner is gone...

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My Oncologist told me they had no idea why, so in case other doctors have told you the same thing, here is a 2015 article explaining why:

Title:
Signal identified that prompts one kidney to grow larger when the other is lost
Date:
May 27, 2015
Source:
Medical College of Georgia at Georgia Regents University
Summary:
When a single kidney is removed because of injury or for transplantation, the remaining kidney can rapidly get 50 to 60 percent bigger, an apparent physiological attempt to expand its capacity. Now, scientists have found an explanation for the century-old observation that if you end up with just one kidney, the lone organ gets bigger.
link to article:

:-)