Can a pelvic ultrasound detect ovarian cancer? what are the chances of having a normal scan and still having it?

Fairly reliable test: Pelvic ultrasound is fairly reliable to detect masses or fluid collections in the pelvis. It will also pick up most cases of Ovarian Cancer. So a normal ultrasound rules out obvious Ovarian cancer. Yet it can miss small tumors arising from the ovary. I think you can relax and not worry about missing cancer if you have no pelvic or abdominal symptoms... which can be quite subtle for ovarian cancer.