DergiPark: 379045tmsjAims: Endometriosis is an illness which is characterized by the estrogen-dependent endometrial tissue localizing on the non-cavity of the uterus. Endometrioma is the cystic mass growing in the ovaries caused by endometriosis. In this case report, the securing of pregnancy on a patient diagnosed with endometrioma after undergoing three in vitro fertilization attempt and reducing ovarian reserve and its relation with endometrioma was presented with literature. Case Report: In vitro fertilization treatment was applied three times on a 30-year-old patient with endometrioma in the right ovary and a history of hypothyroidism and asthma. The patient became pregnant in the 3rd attempt of in vitro fertilization. In different periods of the pregnancy, the patient was treated for vaginal bleeding. In this case report, in vitro fertilization treatment was decided on the patient who consulted our center because of infertility. In the first and the second cycle of in vitro fertilization, the fertility could not be successful. In the third cycle, the pregnancy was conceived by transferring of the frozen embryo from the first trial. Because of the miscarriage threat, the patient was hospitalized three times but now she is 26 weeks pregnant and the follow-ups continue. Conclusion: In some cases, surgery is thought to be useful before in vitro fertilization treatment. However, without the recommendation of any operation, our patient was successfully conceived with the frozen embryos from the first trial in vitro fertilization treatment. It can be thought that doing an operation and the time passed after the operation can cause ovarian reserve to decrease more
