Case Report Decidualized Ovarian Mass Mimicking Malignancy

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 thatmimicked an ovarianmalignancy.MRImay be a useful imagingmodality tomonitor these lesions and guide management. Consultation with a multidisciplinary team accustomed to such conditions will help to tailor the management to each individual. 1.