Mri (for other purpose) found 3 cm. ovarian cyst. post-menopausal, hysterectomy/one ovary. wasn't felt 4 months ago at gyn exam. expect follow-up?

Very likely benign : If a pelvic sonogram confirms that your 3 cm ovarian cyst has thin walls, clear fluid,no septation and normal blood flow, it is most probably benign. If you have a personal history or a family history of breast-colon-endometrial-thyroid tumors, have never been pregnant, never used oral contraceptives, have symptoms and risk factors for ovarian tumors...consult a Gyn oncologist for evaluation.