Related Experiment Video
Updated: May 1, 2026

Z-Scores for Assessing Ovarian Reserve in Young Patients Undergoing Fertility Preservation
Published on: October 25, 2024
Metachronous benign ovarian tumors are not uncommon in children
Seppo Taskinen1, Alda Urtane1, Riitta Fagerholm1
1Department of Pediatric Surgery, Children's Hospital, University of Helsinki, Helsinki, Finland.
Insights
Pediatric patients with mature ovarian teratoma have a significant risk of developing a metachronous contralateral ovarian tumor. Yearly ultrasounds are recommended for early detection and fertility preservation.
Area of Science:
- Gynecology
- Pediatric Oncology
Background:
- Mature ovarian teratomas are common germ cell tumors in pediatric patients.
- Risk of contralateral ovarian tumor development requires further investigation.
Purpose of the Study:
- To assess the incidence and risk of metachronous ovarian tumors in pediatric patients previously treated for mature ovarian teratoma.
Main Methods:
- Retrospective analysis of 22 pediatric patients who underwent oophorectomy for mature teratoma between 1981 and 2011.
- Median follow-up duration of 4.4 years.
Main Results:
- 23% of patients developed a metachronous contralateral ovarian tumor during follow-up.
- Kaplan-Meier analysis indicated a 14% ± 8% risk of contralateral tumor within five years and 66% ± 26% within 10 years.
- Metachronous tumors included mature teratomas and seromucinous infantile cystadenomas; all treated with ovary-preserving surgery.
Conclusions:
- A substantial proportion of pediatric patients with ovarian mature teratoma develop metachronous contralateral tumors.
- Yearly ultrasound surveillance is crucial for early diagnosis, enabling fertility-sparing management.
Purpose:
To evaluate the risk for metachronous ovarian tumor in pediatric patients with mature ovarian teratoma.
Methods:
During 1981-2011, 22 children underwent oophorectomy for mature teratoma at the median age of 11.4 (range 1.5-15.3) years. The patients were followed-up in median 4.4 (range 0.5-25.5) years.
Results:
None of the patients had synchronous bilateral tumor at the time of primary operation, but during follow-up five patients (23%) got metachronous contralateral ovarian tumor. The contralateral tumor was observed in median 3.6 (range 1-8.8) years after the primary operation. According to Kaplan-Meier analysis the risk for contralateral tumor was 14% ± 8% (SE) within five years and 66% ± 26% (SE) within 10 years. In this series, the contralateral tumor was operated by ovary preserving surgery. Three of the metachronous tumors were mature teratomas and two were seromucinous infantile cystadenomas. One patient had a second teratoma recurrence 14 years after the first recurrence.
Conclusions:
More than one fifth of the children with ovarian mature teratoma get metachronous benign tumor to the contralateral ovary. Therefore a yearly ultrasound follow-up is needed for these patients up to potential pregnancy to enable early diagnosis, ovary preserving surgery and maintenance of fertility in the case of metachronous tumor.
Related Concept Videos
Oogenesis
Oogenesis
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is...
The Retinoblastoma Gene
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
Ovarian Cycle
Disorders of the Female Reproductive System
Tumor Progression
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...

