Normal ovary size 2 centimeters. Mine 10 centimeters when surgically removed. Remaining ovary went on to produce 2 health kids. This was 20 years ago.
I've not heard of a radiation pill either. I've heard of radiation treatments where tiny radioactive pellets are inserted near the malignant area to treat that one spot. My father-in-law had that done for his prostate cancer. Less traumatic than full out surgery.
I've not heard of a precancerous ovarian cyst.. You might want to check out the Health Pages at the top right of this page for information on Ovarian Cysts.