Endoscopy and Biopsy 
• A definitive diagnosis requires microscopic examination of part or all of the involved ovary or any other 
  suspicious abdominal mass. Cystic ovarian tumors that are less than 6 cm (2½ in.) in diameter occurring in a 
  premenopausal woman are usually benign cysts.
     Surgical evaluation should be strongly considered for any mass in a postmenopausal woman, masses that are
  larger than 6 cm (2½ in.) in diameter, masses persisting longer than one menstrual cycle and masses that are
  suspicious on imaging of the pelvis.