Objective: Our aim is to reveal the management of pregnant women in the antenatal period or during cesarean section (CS) who are found to have adnexal masses during antenatal period or CS and discuss the consequences thereof based on the literature findings. Methods: The data of 2364 patients with scheduled or emergency CS performed at Koru Ankara Hospital Obstetrics and Gynecology Clinic between June 2013 and December 2018 were retrospectively reviewed. The largest diameter measured in the pathology results was taken as the diameter of the masses. Results: Twenty-six (1.09%) patients were found to have adnexal masses. None of the patients had an adnexal mass known before pregnancy. All cases of fibroids are excluded. Eighteen patients were diagnosed in the antenatal period, in the pregnancy week 10.5±1.2 on average (69%), and no changes were observed in the masses during pregnancy. In 8 cases, however, adnexal masses were detected incidentally during CS (31%). Masses found in 5 out of 26 patients were paraovarian or paratubal (19.2%) whereas the remaining 21 patients were identified to have ovarian masses. The histological types of these ovarian masses can be listed based on their prevalence as follows: mature cystic teratoma (34.6%), serous cystadenoma (15.4%) and endometrioma (15.4%), mucinous cyst (11.5%), and fibroma (3.9%). The masses, which tend to be the largest in size, are serous cystadenomas having an average size of 62.64±22.18 mm.Conclusion: Adnexal masses in pregnancy can be monitored considering the patient’s clinical findings and the presence of a malignancy suspicion or can be operated in the appropriate trimester. Masses observed during cesarean section may be removed and sent for a pathological examination, depending on the surgeon’s decision.