Possible ovarian cancer, prior endometrial cancer

I had endometrial cancer last year, low grade and stage, only hysterectomy needed, and my ovaries looked great, so they left those in and took the tubes (pre menopause). Since then, I have had a lot of discomfort and even tried PPT which didn't help all that much, but overall, I felt pretty good by early fall except for awful back pain. Right after Thanksgiving I got into a pretty nasty car accident and ended up in the ER, they did a CT scan which showed no internal injuries however masses on my ovaries. My oncologist had me get an ultrasound done asap and that did not look great. The doctor there said both masses were concerning for ovarian cancer, I have 2 large complex cysts (one is over 9cm) with moderate blood flow, my right ovary is very enlarged. I am now scheduled to have my ovaries removed at just about a year since my last surgery and the oncologist says it could be benign, borderline, stomal or metastatic from elsewhere, but unlikely epithelial as my tumor markers aren't high enough. He says it's too risky to biopsy beforehand and he will bag the ovaries and do a frozen section during surgery. My CA 125 was 163, Ca 19-9 was 167 and HE4 was borderline at 142, all other markers were normal. I am confused and concerned but hoping it turns out to be easy to treat or benign.