<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. This group of<unk> s accounts for 90% to 95% of all cases of ovarian cancer. The pathogenesis of<unk>  is characterized by the overgrowth of the ovarian<unk>  epithelium. Common risk factors in the development of<unk> , include: nulliparity, early menopause, gonadal dysgenesis, family history (e.g. BRCA1/BRCA2 mutations), smoking, previous history of breast,  and endometrial or colon cancer (Lynch II). The prevalence of<unk>  is approximately 3 per 100,000 individuals worldwide.<unk>  is more commonly observed among postmenopausal women.  Early clinical features of<unk>  include pelvic fullness, abdominal distension, and abdominal pain. The mainstay of therapy for<unk>  is platinum-based chemotherapy. According to the American College of Radiology, secondary prevention of<unk>  may include periodical pelvis or transvaginal ultrasound with or without Doppler.
Surface epithelial-stromal tumor
Solid and pseudopapillary epithelial neoplasm
Mixed mullerian tumor
Villous adenoma
Fibroepithelial neoplasms
Hilus cell tumor
Trichoadenoma
Verrucous carcinoma