A teenage girl with giant multilocular mucinous ovarian cystadenoma complicated by right-sided hydronephrosis: a case report

Introduction . According to the average statistical data, the incidence of ovarian tumors in children comprises about 4.6 %. In the adolescent population, ovarian epithelial tumors confidently hold a leading place. One of their histological subtypes is presented by mucinous cystadenoma. Due to the frequent asymptomatic course or the absence of specific clinical features, such cysts can long persist in the abdominal cavity and reach significant sizes. In the latter case they can manifest with the symptoms of serious complications such as obstruction of the urinary tract and the intestines, pedunculated masses torsion, ovarian torsion, rupture of cysts, etc. Thus, the main insidiousness of ovarian tumors lies in the delayed diagnostics and omitted surgical opportunities for ovary preservation. Aim : to present a clinical case of a teenage girl with giant ovarian cystadenoma complicated by hydronephrosis due to ureteral compression. Case presentation . A female patient R., 17 years old, was admitted to the surgical department on 12.02.2025, with complaints of abdominal enlargement, abdominal pain lasting over 4 months, frequent urinal miction and algodismenorrhea. Medical history dated of January 2025 showed that imaging research methods performed in different organizations revealed a multilocular cyst of the abdominal cavity – a mucinous cystadenoma of the left ovary, sized 193×195×271 mm, complicated by hydronephrosis of the right kidney. Physical examination revealed a local abdominal pain in the umbilical region as well as increased abdominal volume. General blood test found signs of mild iron deficiency. Blood screening tests for serum alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG) and cancer antigen-125 (CA-125) levels allowed to exclude oncological pathology. Results . Further surgical treatment was performed. On 17.02.2025, patient R. underwent laparoscopic cystectomy. The passage of urine quickly returned to normal after removal of obstruction cause. A follow-up ultrasound examination on the day 7 post-surgery showed that the pelvis of the right kidney was markedly decreased. The postoperative period was unremarkable. Patient R. was discharged on day 8 with improvement. Recommendations were provided. Conclusion . A clinical case presented here demonstrates an opportunity for developing complication such as hydronephrosis related to bulky ovarian cyst in adolescents. The surgical treatment confirms that even in case of giant cysts, cystectomy along with preserving maximum volume of the ovarian tissue may be performed thereby allowing to exert reproductive function in the future. However, such surgical treatment option should be performed only with confidence in benign tumor origin and presence of viable ovarian tissue.