 In order to investigate the impact of laparoscopic stripping surgery on follicular ovarian reserve, blood samples will be obtained before the operation, from 2nd to 5th day of the menstrual cycle, to determine levels of endocrine markers of ovarian reserve FSH, E2, AMH and Inhibin B. Cancer antigen 125 CA -125 and IL-6 will be measured also. US markers antral follicular count- AFC will be obtained at the same time as endocrine markers. All laparoscopic stripping surgery will be performed during the early or middle follicular phases of menstrual cycle, under general anesthesia, by the same team of gynecological endoscopist. The cyst wall will be completely stripped off from the normal ovarian tissue by traction and opposite traction with two grasping forceps. Hemostasis will be achieved using bipolar forceps electrocoagulation. All endometrioma specimens that will be obtained from operation will be submitted for pathology examination. One and six months after the laparoscopic cystectomy, from 2nd to 5th day of menstrual cycle, we will determine endocrine markers of ovarian reserve and levels of CA 125 and IL-6. 