This video demonstrates bilateral salpingo-oophorectomy, also known as a BSO, is a surgical procedure in which both of the ovaries and the fallopian tubes are removed. This surgery is usually performed during a hysterectomy, in which a woman's uterus is removed, but not always. Oophorectomy is most often performed because of diseases such as ovarian cysts or cancer; as prophylaxis to reduce the chances of developing ovarian cancer or breast cancer; or in conjunction with hysterectomy (removal of the uterus).