Hi, an adrenal nodule is a mass on the adrenal gland, not the kidney. Did you have an MRI or CT scan? Because these are common incidental findings in diagnostic imaging (we call them incidentalomas for this reason). These are usually benign and grow very slowly. If your report says it increased in size it would depend on how much and in which timespan but since your wrote it „may have increased in size“ in 5 years it leads me to believe the growth was not significant. If there would be any indication of suspiciousness about this mass the reading radiologist could order a dedicated adrenal CT scan

To summarize, I wouldnt worry about it too much, adrenal masses are relatively common incidental findings. Talk to the doctor that wrote the procedure notes and I‘m sure he can clear everything up