Related Experiment Video
Updated: Jul 4, 2026

Electromyometrial Imaging of Uterine Contractions in Pregnant Women
Published on: May 26, 2023
Magnetic resonance manifestations of decidualized endometriomas during pregnancy
Mayumi Takeuchi1, Kenji Matsuzaki, Hiromu Nishitani
1Department of Radiology, University of Tokushima, 3-18-15 Kuramoto-cho, Tokushima, Japan. mayumi@clin.med.tokushima-u.ac.jp
Objective:
Decidual changes of endometrial tissue in endometriomas during pregnancy may manifest as mural nodules and mimic malignant transformation. We evaluated magnetic resonance findings of decidualized ovarian endometriomas for the differentiation from malignant transformation.
Methods:
Magnetic resonance manifestations of 5 decidualized ovarian endometriomas were evaluated. High b-value diffusion-weighted images were performed in 3 cases.
Results:
The mural nodules were demonstrated as linear, small nodular, broad-based nodular, or polypoid structures, which showed prominent hyperintensity on T2-weighted images and on diffusion-weighted images similar to normal endometrium or placenta. The apparent diffusion coefficient of decidualized mural nodules was significantly higher than that of malignant mural nodules of 7 ovarian cancers.
Conclusions:
Endometrioma with prominent hyperintense mural nodules on T2-weighted images in a pregnant woman is highly suggestive for decidualized endometriomas. Diffusion-weighted images with the apparent diffusion coefficient measurement may help the diagnosis of this rare entity.
More Related Videos
07:20Intraoperative Detection of Subtle Endometriosis: A Novel Paradigm for Detection and Treatment of Pelvic Pain Associated with the Loss of Peritoneal Integrity
Published on: December 21, 2012
07:37Isolation of Primary Human Decidual Cells from the Fetal Membranes of Term Placentae
Published on: April 30, 2018
Related Concept Videos
Magnetic Resonance Imaging
Imaging Studies IV: Magnetic Resonance Imaging