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Here we present a peculiar case of a solitary fibrous tumor arising in the paratesticular region and exhibiting leiomyoma-like morphology. Confirmation of the tumor as a solitary fibrous tumor was achieved by RNA sequencing showing NAB2::STAT6 fusion. Possible explanations for the unusual tumor morphology include entrapment of normal smooth muscle elements and tumor differentiation into smooth muscle type cells.<\/jats:p>","DOI":"10.1177\/10668969221091585","type":"journal-article","created":{"date-parts":[[2022,4,11]],"date-time":"2022-04-11T10:20:38Z","timestamp":1649672438000},"page":"921-925","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Shapeshifters in Pathology: Paratesticular Solitary Fibrous Tumor Mimicking Leiomyoma"],"prefix":"10.1177","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8695-7561","authenticated-orcid":false,"given":"Matthew E","family":"Hogan","sequence":"first","affiliation":[{"name":"Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sarah P.","family":"Psutka","sequence":"additional","affiliation":[{"name":"Department of Urology, University of Washington, Seattle, Washington, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yajuan J.","family":"Liu","sequence":"additional","affiliation":[{"name":"University of Washington School of Medicine, Seattle, Washington, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0819-9638","authenticated-orcid":false,"given":"Maria S","family":"Tretiakova","sequence":"additional","affiliation":[{"name":"Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2022,4,11]]},"reference":[{"key":"bibr1-10668969221091585","doi-asserted-by":"publisher","DOI":"10.1038\/modpathol.2017.54"},{"key":"bibr2-10668969221091585","volume-title":"WHO Classification of Tumours of Soft Tissue and Bone","author":"Fletcher CDM","year":"2013"},{"key":"bibr3-10668969221091585","doi-asserted-by":"publisher","DOI":"10.1097\/PAS.0b013e31826a92f5"},{"key":"bibr4-10668969221091585","doi-asserted-by":"publisher","DOI":"10.1016\/j.ehpc.2020.200461"},{"key":"bibr5-10668969221091585","doi-asserted-by":"publisher","DOI":"10.2214\/AJR.09.3787"},{"key":"bibr6-10668969221091585","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2559.1992.tb00457.x"},{"key":"bibr7-10668969221091585","doi-asserted-by":"publisher","DOI":"10.1155\/2018\/7462032"},{"issue":"3","key":"bibr8-10668969221091585","first-page":"3358","volume":"8","author":"Zhou Y","year":"2015","journal-title":"Int J Clin Exp Pathol"},{"key":"bibr9-10668969221091585","doi-asserted-by":"publisher","DOI":"10.1007\/s12105-011-0254-2"},{"key":"bibr10-10668969221091585","doi-asserted-by":"publisher","DOI":"10.1111\/cup.13717"},{"key":"bibr11-10668969221091585","doi-asserted-by":"publisher","DOI":"10.3109\/01913120903352177"},{"key":"bibr12-10668969221091585","doi-asserted-by":"publisher","DOI":"10.1007\/s00428-005-1261-z"},{"key":"bibr13-10668969221091585","doi-asserted-by":"publisher","DOI":"10.1097\/PAS.0000000000000137"},{"key":"bibr14-10668969221091585","doi-asserted-by":"publisher","DOI":"10.1038\/modpathol.2013.247"}],"container-title":["International Journal of Surgical Pathology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/10668969221091585","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/10668969221091585","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/10668969221091585","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T10:22:27Z","timestamp":1777458147000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/10668969221091585"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,4,11]]},"references-count":14,"journal-issue":{"issue":"8","published-print":{"date-parts":[[2022,12]]}},"alternative-id":["10.1177\/10668969221091585"],"URL":"https:\/\/doi.org\/10.1177\/10668969221091585","relation":{},"ISSN":["1066-8969","1940-2465"],"issn-type":[{"value":"1066-8969","type":"print"},{"value":"1940-2465","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,4,11]]}}}