Whst is ddone for a cyst on a kidney?

Depending on size: There are several reasons for cysts on kidneys. Need to look at the number, size, cyst characters. Single cyst , size< 4 cm, stable size over 1-2 years is likely to be benign. Also depending on whether there is any blood in urine, pain, high blood pressure.

Depends: The radiologist is able to tell whether it is simple or complex cyst. If it is simple cyst and your kidney function is normal with normal urine test, there is nothing to worry about.