Cortical Renal Cyst What Are Bilateral Renal Cortical Cysts?

What are bilateral renal cortical cysts? - cortical renal cyst

Rencently I had kidney stones removed, and before the operation that checked and found that these "cysts" I was curious to know what they were, they are not dangerous, and if they still do not do anything with my left kidney, with much bigger than my right?