The frequency thereafter will depend on how suspicious the baseline mammogram is on review. A gynecological oncologist specializes in gynecological cancers. If the cysts are on the ovary, you should have periodic pelvic exams and ultrasounds to be sure they are not growing. If they grow, they should be removed. This evidence has been challenged in recent years.
Similar evidence exists for endrometrial cancer and ovarian cancer.
These diseases seem to be more common in societies that have a high level of fat intake in their diet. I had endometrial cancer last year. Cysts in the breasts can be a malignancy so they must be investigated and removed if suspicious. Deciding which ones need to be removed requires a physical breast exam by a physician with mammography and possibly ultrasound examination. Women who have endometrial cancer should be monitored closely for breast cancer because they are at slightly increased risk for breast cancer.