Surgery, yes or no?

I got blood work done about a week and a half ago for ovarian neoplasm (cancer) due to a larger cyst on my ovary. The tests came back with normal levels, yet, my doctor wants me to do surgery to remove it. Mind you I've only had the cyst for about a month and some take three to four months to absorb themselves. Is this really medically necessary? I have no pain or anything with it. It's kind of just there.

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