Surgery has been the standard of care for decades and may be necessary in obtaining a specimen for diagnosis. The surgery depends upon the extent of nearby invasion of other tissues by the cancer when it is diagnosed. This extent of the cancer is described by assigning it a stage, the presumed type, and the grade of cancer. The gynecological surgeon may remove one (unilateral oophorectomy) or both ovaries (bilateral oophorectomy). The Fallopian tubes (salpingectomy), uterus (hysterectomy), and the omentum (omentectomy) may also be removed. Typically, all of these organs are removed.