 [ Symptoms ] diagnosed with a benign ovarian cyst around 10cm clinic wants to do full hysterectomy need second opinion [ Disease ] hi 10 cm is large so surgical removal to ovary is recommended however your doctors idea is why leave any thing behind that may develop cancer  is not doing full hysterectomy better why most study is suggest that ovaries are almost useless post menopause fewer study is suggest that they can help heart in my opinion if you measure risks and benefits full hystrectomy is better than just trying to remove the cyst notice that uterus is completely useless however you can ask your doctor to do hysterectomy leaving one ovary behind  half measure good luck