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Case Reports in Obstetrics and Gynecology
Volume 2017, Article ID 5810515, 4 pages
Case Report

Ovarian Mature and Immature Teratomas in Monozygotic Twins: A Case Report of Simultaneous Presentation

1Department of Obstetrics and Gynecology, Nippon Medical School, Tokyo, Japan
2Department of Obstetrics and Gynecology, Tokyo Rinkai Hospital, Tokyo, Japan

Correspondence should be addressed to Daisuke Shigemi;

Received 21 December 2016; Revised 26 January 2017; Accepted 26 January 2017; Published 15 February 2017

Academic Editor: Kyousuke Takeuchi

Copyright © 2017 Daisuke Shigemi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Mature cystic teratoma is one of the most common kinds of ovarian tumor, and immature teratoma is a rare tumor, representing less than 1% of all ovarian teratomas. Although there are some reports about familial occurrences of ovarian tumors, literature concerning the clinical cases of monozygotic twins is rare. We report the 5-year clinical courses of a 12-year-old Japanese girl with a recurrent bilateral ovarian mature teratoma and her monozygotic twin with a unilateral ovarian mature teratoma and contralateral ovarian immature teratoma. This is the first clinical report on mature and immature teratomas of the ovary in monozygotic twins. Our cases support future clarification of the molecular mechanism and pathogenesis of teratoma.