Decidualized Endometrioma During Pregnancy
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Decidualized endometriomas mimicking ovarian cancer can be prospectively diagnosed during pregnancy by ultrasound and MRI findings of nodules similar to uterine decidua.
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Abstract
OBJECTIVE: To present the ultrasound and magnetic resonance imaging findings that may allow for a prospective diagnosis and expectant management of decidualized endometriomas because the rare occurrence of decidualization in the ectopic endometrial stroma of an endometrioma during pregnancy can mimic ovarian cancer at imaging. CASE REPORT: Smooth lobulated mural nodules with prominent internal vascularity were noted in an apparent right ovarian endometrioma on serial ultrasound studies in a 34-year-old woman at 12, 21, 27, and 30 weeks of gestation. Magnetic resonance imaging demonstrated the nodules to be strikingly similar in intensity and texture to the decidualized endometrium in the uterus on T2-weighted sequences. A provisional diagnosis of decidualized endometrioma allowed for expectant management with immediate postpartum resection and confirmation of the diagnosis. CONCLUSIONS: Decidualized endometrioma can mimic ovarian malignancy during pregnancy, but a prospective diagnosis may be possible when solid smoothly lobulated nodules with prominent internal vascularity within an endometrioma are seen from early in pregnancy, and the nodules demonstrate marked similarity in signal intensity and texture with the decidualized endometrium in the uterus at magnetic resonance imaging.
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Cited by (24)
- Imaging Diagnosis of Decidualized Endometriotic Cysts 2025
- Endometrioma Unveiled: A Comprehensive Review of the Pathogenesis, Diagnosis, and Current Management Strategies of Ovarian Endometriosis 2023
- Decidualized endometrioma mimicking malignancy: A case report and literature review of magnetic resonance imaging findings 2023
- Decidualized ovarian endometrioma mimicking malignancy in pregnancy: a case report and literature review 2022
- Endometriosis and adverse pregnancy outcome 2021
- Endometriosis in pregnancy 2020
- Understanding malignant transformation of endometriosis: imaging features with pathologic correlation 2019
- The Sonographic Spectrum of Pelvic Endometriosis 2019
- Ultrasound of Pelvic Pain in the Nonpregnant Woman 2019
- Uterine artery pseudoaneurysm in the setting of deep endometriosis: an uncommon cause of hemoperitoneum in pregnancy 2017
- Endometriomas and Pelvic Endometriosis 2016
- A systematic review on endometriosis during pregnancy: diagnosis, misdiagnosis, complications and outcomes 2015
- Decidualized Ovarian Endometrioma in a Pregnant Woman Mimicking Ovarian Malignancy: Magnetic Resonance Imaging and Ultrasonographic Findings 2015
- A Case of Bilateral Decidualized Endometriomas during Pregnancy: Radiologic-pathologic Correlation. 2015
- Natural history of ovarian endometrioma in pregnancy 2014
- Endometriosis 2014
- Endometriosis encountered in a primigravida and a primipara at caesarean section: Report of two cases 2014
- Decidualisation of ovarian endometriomas in pregnancy: a management dilemma. A case report and review of the literature 2014
- Tuba ovarian abscesses formation from decidualized ovarian endometrioma after appendiceal endometriosis presenting as acute appendicitis in pregnancy. 2012
- The effect of the hormonal milieu of pregnancy on deep infiltrating endometriosis: serial ultrasound assessment of changes in size and pattern of deep endometriotic lesions 2011
- Polypoid endometriosis of the bladder during pregnancy mimicking urachal carcinoma 2011
- Unusual Manifestations and Complications of Endometriosis—Spectrum of Imaging Findings: <i>Pictorial Review</i> 2010
- Imaging malignant and apparent malignant transformation of benign gynaecological disease 2010
- Decidualized endometrioma 2010
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- europepmc
- last seen: 2026-06-13T06:22:48.782012+00:00
- openalex
- last seen: 2026-06-10T17:14:06.276822+00:00
- pubmed
- last seen: 2026-05-13T22:14:30.652814+00:00
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