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Hi and thanks for the query.
Renal cysts are largely benign in nature and without symptoms if found incidentally in a scan for something else like in your son's case are mostly of a non serious nature. However, much depends on how many they are, where they are located and what their size is. Most small cysts usually just require annual scans to see if they are increasing in size. Polycystic kidney disease, which is a concern which usually presents with frank symptoms like pain, high blood pressure, excessive urination and blood in the urine. Since, there are no symptoms this is most likely benign cysts that will cause no harm and will require just annual scans for observation.
Having said that, I would suggest that your son sees a nephrologist for a definitive opinion on these.
Hope this helps.
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