Ovarian cancer is a sort of cancer that begins in the ovaries. The female reproductive system encompasses two ovaries, one on each side of the uterus. The ovaries — each about the size of an almond produce ova as well as the hormones estrogen and progesterone. Ovarian cancer frequently goes unobserved until it has spread within the pelvis and abdomen. At this late stage, ovarian cancer is more challenging to treat. Early-stage ovarian cancer in which the disease is limited to the ovary is likely to be treated successfully. Surgery and chemotherapy are commonly used to treat ovarian cancer. Epithelial ovarian tumors Epithelial ovarian tumors start on the external surface of the ovaries. These tumors can be benign borderline (low malignant potential), or malignant (cancer). Benign epithelial ovarian tumors Epithelial ovarian tumors that are benign don’t spread and frequently don’t lead to serious illness. There are several kinds of benign epithelial tumors including serous cystadenomas, mucinous cystadenomas and Brenner tumors. Borderline Epithelial Tumors Ovarian epithelial tumors don’t evidently appear to be cancerous and are known as borderline epithelial ovarian cancer. The two utmost common types are atypical proliferative serous carcinoma and atypical proliferative mucinous carcinoma. These tumors were earlier called tumors of low malignant potential (LMP tumors). These are dissimilar from typical ovarian cancers because they don’t cultivate into the supporting tissue of the ovary (called the ovarian stroma). If they do spread exterior to the ovary, for example, into the abdominal cavity (belly), they might raise on the lining of the abdomen but not into it Borderline tumors incline to affect younger women than the typical ovarian cancers. These tumors grow gradually and are less life-threatening than utmost ovarian cancers.