{"paper_id":"bc4d3ca7-7d51-48ed-86c1-82dc9a5cdb82","body_text":"Abstract\nPurpose\nExtra-ovarian endometriosis (EOE) usually appears as solid masses mimicking neoplasms both clinically and radiologically. Detection of blood products within a lesion may be suggestive of its endometriotic nature. We present a descriptive study of MR imaging findings that include susceptibility-weighted imaging (SWI) for patients with EOE.\nMethods\nEight pathologically proven EOE (3 bowel, 2 bladder and 3 abdominal wall) were evaluated. Fat-saturated T1-weighted images (fsT1WI) and SWI were obtained using 1.5T MR imaging. Images were reviewed for the presence of signal voids on SWI and of high-intensity foci on fsT1WI.\nResults\nHigh-intensity foci reflecting subacute hemorrhage were detected in 4 of 8 lesions (50%) on fsT1WI, whereas signal voids reflecting acute to chronic hemorrhage were detected in all 8 lesions (100%) on SWI.\nConclusions\nSWI is a sensitive MRI technique which demonstrates hemorrhage of varying chronicity in patients with EOE and may improve future MRI characterization of EOE.\nSimilar content being viewed by others\nReferences\nOlive DL, Schwartz LB (1993) Endometriosis. N Engl J Med 328:1759–1769\nBazot M, Darai E, Hourani R, et al. (2004) Deep pelvic endometriosis: MR imaging for diagnosis and prediction of extension of disease. Radiology 232:379–389\nGougoutas CA, Siegelman ES, Hunt J, Outwater EK (2000) Pelvic endometriosis: various manifestations and MR imaging findings. Am J Roentgenol 175:353–358\nChoudhary S, Fasih N, Papadatos D, Surabhi VR (2009) Unusual imaging appearances of endometriosis. Am J Roentgenol 192:1632–1644\nWong-You-Cheong JJ, Woodward PJ, Manning MA, Davis CJ (2006) From the archives of the AFIP: inflammatory and nonneoplastic bladder masses: radiologic-pathologic correlation. Radiographics 26:1847–1868\nGidwaney R, Badler RL, Yam BL, et al. (2012) Endometriosis of abdominal and pelvic wall scars: multimodality imaging findings, pathologic correlation, and radiologic mimics. Radiographics 32:2031–2043\nTogashi K, Nishimura K, Kimura I, et al. (1991) Endometrial cysts: diagnosis with MR imaging. Radiology 180:73–78\nSiegelman ES, Outwater EK (1999) Tissue characterization in the female pelvis by means of MR imaging. Radiology 212:5–18\nSiegelman ES, Outwater E, Wang T, Mitchell DG (1994) Solid pelvic masses caused by endometriosis: MR imaging features. Am J Roentgenol 163:357–361\nBusard MP, Mijatovic V, van Kuijk C, Hompes PG, van Waesberghe JH (2010) Appearance of abdominal wall endometriosis on MR imaging. Eur Radiol 20:1267–1276\nBusard MP, Mijatovic V, Lüchinger AB, et al. (2012) MR imaging of bladder endometriosis and its relationship with the anterior uterine wall: experience in a tertiary referral centre. Eur J Radiol 81:2106–2111\nHaacke EM, Xu Y, Cheng YC, Reichenbach JR (2004) Susceptibility weighted imaging (SWI). Magn Reson Med. 52:612–618\nSehgal V, Delproposto Z, Haddar D, et al. (2006) Susceptibility-weighted imaging to visualize blood products and improve tumor contrast in the study of brain masses. J Magn Reson Imaging 24:41–51\nTakeuchi M, Matsuzaki K, Nishitani H (2008) Susceptibility-weighted MRI of endometrioma: preliminary results. Am J Roentgenol 191:1366–1370\nSolak A, Sahin N, Genç B, et al. (2013) Diagnostic value of susceptibility-weighted imaging of abdominal wall endometriomas during the cyclic menstrual changes: a preliminary study. Eur J Radiol 82:e411–e416\nBusard MP, Pieters-van den Bos IC, Mijatovic V, et al. (2012) Evaluation of MR diffusion-weighted imaging in differentiating endometriosis infiltrating the bowel from colorectal carcinoma. Eur J Radiol 81:1376–1380\nLöbel U, Sedlacik J, Sabin ND, et al. (2010) Three-dimensional susceptibility-weighted imaging and two-dimensional T2*-weighted gradient-echo imaging of intratumoral hemorrhages in pediatric diffuse intrinsic pontine glioma. Neuroradiology 52:1167–1177\nAuthor information\nAuthors and Affiliations\nCorresponding author\nRights and permissions\nAbout this article\nCite this article\nTakeuchi, M., Matsuzaki, K. & Harada, M. Susceptibility-weighted MRI of extra-ovarian endometriosis: preliminary results. Abdom Imaging 40, 2512–2516 (2015). https://doi.org/10.1007/s00261-015-0378-z\nPublished:\nIssue date:\nDOI: https://doi.org/10.1007/s00261-015-0378-z","source_license":"CC0","license_restricted":false}