{"paper_id":"5ff44203-3ed7-446d-b2a4-41a36954051a","body_text":"Abstract\nPurpose\nDecidualized endometriomas (DEs) and seromucinous borderline tumors (SMBTs) exhibit similar MR findings including markedly hyperintense mural nodules within endometriotic cysts on T2-weighted images. The present study aimed to assess the efficacy of MR imaging for differentiating between DEs and SMBTs of the ovary.\nMaterials and methods\nMR images of 8 DEs and 14 SMBTs were retrospectively assessed and compared according to pathologies.\nResults\nWith regard to quantitative assessments of mural nodules, the number and signal intensity ratios (SIRs) on T1-weighted images were significantly greater in DEs than in SMBTs (11.0 ± 8.4 vs. 4.3 ± 4.1, p < 0.05 and 2.36 ± 0.56 vs. 1.49 ± 0.27, p < 0.01, respectively), whereas the height was significantly lower in DEs than in SMBTs (4.5 ± 1.4 mm vs. 21.9 ± 11.4 mm, p < 0.01). However, there were no significant differences between DEs and SMBTs in the SIRs on T2-weighted images, SIRs on diffusion-weighted images, and apparent diffusion coefficient values. With regard to qualitative assessments of mural nodules, the lobulated margin, pedunculated configuration, and T2 hypointense core were significantly more frequent in SMBTs than in DEs (71% vs. 0%, p < 0.01; 86% vs. 0%, p < 0.01; and 43% vs. 0%, p < 0.05, respectively).\nConclusion\nThe number, height, SIRs on T1-weighted images, lobulated margin, pedunculated configuration, and T2 hypointense core of mural nodules within endometriotic cysts were useful MR findings for differentiating DEs from SMBTs.\nSimilar content being viewed by others\nReferences\nSchindler AE (2004) Pathophysiology, diagnosis and treatment of endometriosis. Minerva Ginecol 56:419-435.\nVigano P, Parazzini F, Somigliana E, et al. (2004) Endometriosis: epidemiology and aetiological factors. Best Pract Res Clin Obstet Gynaecol 18:177-200.\nTakeuchi M, Matsuzaki K, Uehara H, et al. (2006) Malignant transformation of pelvic endometriosis: MR imaging findings and pathologic correlation. Radiographics 26:407-417.\nBourgioti C, Preza O, Panourgias E, et al. (2017) MR imaging of endometriosis: Spectrum of disease. Diagn Interv Imaging 98:751-767.\nRutgers JL, Scully RE (1988) Ovarian mullerian mucinous papillary cystadenomas of borderline malignancy. A clinicopathologic analysis. Cancer 61:340-348.\nKim KR, Choi J, Hwang JE, et al. (2010) Endocervical-like (Mullerian) mucinous borderline tumours of the ovary are frequently associated with the KRAS mutation. Histopathology 57:587-596.\nTanaka YO, Okada S, Yagi T, et al. (2010) MRI of endometriotic cysts in association with ovarian carcinoma. AJR Am J Roentgenol 194:355-361.\nSiegelman ES, Oliver ER (2012) MR imaging of endometriosis: ten imaging pearls. Radiographics 32:1675-1691.\nTakeuchi M, Matsuzaki K, Nishitani H (2008) Magnetic resonance manifestations of decidualized endometriomas during pregnancy. J Comput Assist Tomogr 32:353-355.\nMorisawa N, Kido A, Kataoka M, et al. (2014) Magnetic resonance imaging manifestations of decidualized endometriotic cysts: comparative study with ovarian cancers associated with endometriotic cysts. J Comput Assist Tomogr 38:879-884.\nKataoka M, Togashi K, Koyama T, et al. (2002) MR imaging of mullerian mucinous borderline tumors arising from endometriotic cysts. J Comput Assist Tomogr 26:532-537.\nKurata Y, Kido A, Moribata Y, et al. (2017) Diagnostic performance of MR imaging findings and quantitative values in the differentiation of seromucinous borderline tumour from endometriosis-related malignant ovarian tumour. Eur Radiol 27:1695-1703.\nTakeuchi M, Matsuzaki K, Harada M (2016) Computed diffusion-weighted imaging for differentiating decidualized endometrioma from ovarian cancer. Eur J Radiol 85:1016-1019.\nLiu T, Sumida D, Wada T, et al. (2019) A diagnostic challenge of seromucinous borderline tumor: A case report. Medicine (Baltimore) 98:e15707.\nLeiserowitz GS, Xing G, Cress R, et al. (2006) Adnexal masses in pregnancy: how often are they malignant? Gynecol Oncol 101:315-321.\nMatsubayashi RN, Matsuo Y, Nakazono T, et al. (2015) Magnetic resonance imaging manifestations of ovarian mullerian mixed epithelial borderline tumors: imaging and histologic features in comparison with mullerian mucinous borderline tumors. J Comput Assist Tomogr 39:276-280.\nKurata Y, Kido A, Moribata Y, et al. (2018) Differentiation of Seromucinous Borderline Tumor from Serous Borderline Tumor on MR Imaging. Magn Reson Med Sci 17:211-217.\nFruscella E, Testa AC, Ferrandina G, et al. (2004) Sonographic features of decidualized ovarian endometriosis suspicious for malignancy. Ultrasound Obstet Gynecol 24:578-580.\nYoshida S, Onogi A, Shigetomi H, et al. (2008) Two cases of pregnant women with ovarian endometrioma mimicking a malignant ovarian tumor. J Clin Ultrasound 36:512-516.\nRodriguez IM, Irving JA, Prat J (2004) Endocervical-like mucinous borderline tumors of the ovary: a clinicopathologic analysis of 31 cases. Am J Surg Pathol 28:1311-1318.\nShimamoto A, Isomoto I, Segawa K, et al. (2014) The MRI findings in a case of ovarian mucinous borderline tumor mimicking a serous surface borderline tumor. Jpn J Radiol 32:552-555.\nTanase Y, Kawaguchi R, Takahama J, et al. (2018) Factors that Differentiate between Endometriosis-associated Ovarian Cancer and Benign Ovarian Endometriosis with Mural Nodules. Magn Reson Med Sci 17:231-237.\nExpert Panel on MRS, Kanal E, Barkovich AJ, et al. (2013) ACR guidance document on MR safe practices: 2013. J Magn Reson Imaging 37:501-530.\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\nThis article does not contain any studies with human participants or animals performed by any of the authors.\nInformed consent\nInformed consent waiver was obtained by institutional review board for this study.\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\nAndo, T., Kato, H., Kawaguchi, M. et al. MR findings for differentiating decidualized endometriomas from seromucinous borderline tumors of the ovary. Abdom Radiol 45, 1783–1789 (2020). https://doi.org/10.1007/s00261-020-02412-x\nPublished:\nVersion of record:\nIssue date:\nDOI: https://doi.org/10.1007/s00261-020-02412-x","source_license":"CC0","license_restricted":false}