I am not a doctor or any sort of medical practitioner. I had not heard of this problem before, however, I have done some checking. One web site states that complex kidney cysts have a low risk for being or becoming a kidney cancer, but should always be evaluated by a Urologist to be certain. I think that there's every hope that you will be ok and we'll all keep our fingers crossed for you.
I imagine that most people on this forum have been through the agonising wait for tests and then the even more agonising wait for results. Please be reassured that here is a safe place to express your fears and seek reassurance.
Best wishes
Bob
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