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Case Reports in Obstetrics and Gynecology
Volume 2015, Article ID 217367, 4 pages
Case Report

Decidualized Ovarian Mass Mimicking Malignancy

1Department of Obstetrics and Gynecology, University Hospital Pellegrin, 33076 Bordeaux, France
2Department of Radiology, University Hospital Saint-Andre, 33000 Bordeaux, France
3Department of Pathology, University Hospital Haut-Leveque, 33604 Pessac, France

Received 12 February 2015; Accepted 18 March 2015

Academic Editor: Kaei Nasu

Copyright © 2015 Lufee Wong 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.


Deciduosis classically occurs in the context of known endometriosis in the pelvis, most commonly in the ovaries, but also in the peritoneum. However, ovarian deciduosis outside the context of endometriosis is rare and makes diagnosis difficult, especially as the sonographic appearance suggests a malignant process. We report a case of decidualized ovarian mass in a patient without prior history of endometriosis that mimicked an ovarian malignancy. MRI may be a useful imaging modality to monitor these lesions and guide management. Consultation with a multidisciplinary team accustomed to such conditions will help to tailor the management to each individual.