Objective: Ovarian cysts are a very common gynecological problem in adolescents and teenagers. The majority of ovarian cysts are benign, with only a small percentage of cases progressing to malignancy. Ovarian serous cystadenoma is uncommon in children, and it can progress to benign or malignant papillary serous tumors with oncological changes.

Case report: The 18-year-old female patient arrived at the clinic complaining of abdominal heaviness and pain. Some cystic non-mobile mass was palpable up to 6cm above the umbilical level on abdominal examination. On ultrasonographic examination, a cystic mass measuring 17 x 10 x 8 cm was discovered in the right ovary and was not seen separately; a 7 x 6 cm cystic swelling was discovered in the left ovary. Serum CEA and CA 125 levels were measured and found to be 1.29 and 14.9, respectively, for further onco analysis, both of which were within normal limits. The tube was gently separated from the mass using a skilled surgical technique, and the cystic mass from both ovaries was removed. The cystic masses were sent for histopathological examination, which revealed that they were benign papillary serous tumors.

Conclusion: A benign papillary serous tumor in a teenage girl is a rare and difficult finding. Cysts are common, but papillary serous tumors are unusual. Careful USG and early diagnosis of such cysts, as well as skillful surgical removal of such cysts, can improve the quality of life in teenagers.