@sultanvr I had a small mass on my right kidney several years ago. It turned out to be cancerous. My urologist sent me to a interventional radiologist as an outpatient painless procedure. He performed at a local hospital a cryoablation which means he "froze" the cancerous mass that would later dissipate. I took X rays for the first 5 years and was and remain cancer free. I urge you to see an interventional radiologist. This had for me no effect on my eGFR.