@oleander55 Welcome to Mayo Clinic Connect!

According to the National Institute on Health, people over 50 do have increased chances for a renal cyst. You don't mention what discomfort you are experiencing. For me, I also have had several cysts. Regular ultrasounds to watch them has helped monitor so there is less worry about progression into something else. A good urologist will make sure there is no sign of cancer or turning from a simple cyst to something that needs to be dealt with immediately.

For your peace of mind, and documentation, perhaps a second opinion will be in order? What do you think?
Ginger