{"paper_id":"c9f4731c-161d-40b6-b4e5-2109b6ef89b8","body_text":"Abstract\nPolypoid endometriosis is a benign, rare variant of endometriosis that forms polypoid nodules mimicking malignant tumors. For three cases of polypoid endometriosis of female genital organs, this report presents characteristic MR imaging features reflecting the histopathological findings. The solid and microcystic pattern or the multilocular pattern both reflecting dilated endometrial glands, and characteristic morphology of the nodules, multilobulated or polypoid-shaped, were helpful diagnostic clues present in these three cases. Earlier reported MR findings were also recognized, including signal intensity similar to that of the endometrium on T2-weighted image and contrast enhanced T1-weighted image, hypointense rim on T2-weighted image, lack of diffusion restriction, and hyperintense foci on T1-weighted image. Two cases were diagnosed preoperatively based on MR imaging findings as polypoid endometriosis. 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Obstet Gynecol 102:1127–1130. https://doi.org/10.1016/S0029-7844(03)00628-8\nFunding\nNo funding was received for this study.\nAuthor information\nAuthors and Affiliations\nCorresponding author\nEthics declarations\nConflict of interest\nThe authors declare that they have no conflict of interest.\nEthical approval\nAll procedures performed in studies involving human participants were conducted in accordance with ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. For a study of this type, formal consent is not required.\nInformed consent\nThe requirement for written informed consent was waived for this case report based on the opt-out system of our institution.\nAdditional information\nPublisher's Note\nSpringer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.\nRights and permissions\nAbout this article\nCite this article\nYajima, R., Kido, A., Minamiguchi, S. et al. MR findings of polypoid endometriosis of female genital organs: report of three cases. Abdom Radiol 47, 1968–1974 (2022). https://doi.org/10.1007/s00261-022-03530-4\nReceived:\nRevised:\nAccepted:\nPublished:\nVersion of record:\nIssue date:\nDOI: https://doi.org/10.1007/s00261-022-03530-4","source_license":"CC0","license_restricted":false}