<unk> s are a class of ovarian neoplasms that may be benign or malignant. Neoplasms in this group are thought to be derived from the ovarian<unk>  epithelium (modified peritoneum) or from ectopic endometrial or Fallopian tube (tubal) tissue.<unk> s of this type are also called ovarian adenocarcinoma. This group of<unk> s accounts for 90% to 95% of all cases of ovarian cancer; however is mainly only found in postmenopausal women with the exception of the United States where 7% of cases occur in women under the age of 40. Serum CA-125 is often elevated but is only 50% accurate so it is not a useful<unk>  marker to assess the progress of treatment. 75% of women with<unk>  ovarian cancer are found within the advanced-stages; however younger patients are more likely to have better prognoses than older patients.
Surface epithelial-stromal tumor
Germ cell neoplasia in situ
Keratin implantation cyst
Stromal tumor
Leiomyomatous hamartoma
Neural fibrolipoma
Mammary-type myofibroblastoma
Sclerosing polycystic adenosis