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Similar morphologic variations of MTMF have now been described which mirror those seen in the breast. We describe a case of intra-abdominal MTMF composed of short fascicles of eosinophilic spindle cells admixed with mature adipose tissue. The spindle cells stained diffusely positive for CD34, desmin, smooth muscle actin, and h-caldesmon by immunohistochemistry. Concurrent loss of RB1 (13q14) and 13q34 loci were confirmed by fluorescence in situ hybridization whereas anchored multiplex PCR and whole transcriptome sequencing did not reveal any pathognomonic fusions suggesting an alternative diagnosis. To the best of our knowledge this is the first documented case of leiomyomatous variant of MTMF.<\/jats:p>","DOI":"10.1177\/10668969211031309","type":"journal-article","created":{"date-parts":[[2021,8,2]],"date-time":"2021-08-02T09:02:03Z","timestamp":1627894923000},"page":"200-206","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":4,"title":["Mammary-type Myofibroblastoma with Leiomyomatous Differentiation: A Rare Variant with Potential Pitfalls"],"prefix":"10.1177","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6213-0095","authenticated-orcid":false,"given":"Alexander M.","family":"Strait","sequence":"first","affiliation":[{"name":"Dartmouth-Hitchcock Medical Center Lebanon, NH, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julia A.","family":"Bridge","sequence":"additional","affiliation":[{"name":"University of Nebraska Medical Center, Omaha, NE, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anthony J.","family":"Iafrate","sequence":"additional","affiliation":[{"name":"Massachusetts General Hospital, Boston, MA, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marilyn M.","family":"Li","sequence":"additional","affiliation":[{"name":"The Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7227-7426","authenticated-orcid":false,"given":"Feng","family":"Xu","sequence":"additional","affiliation":[{"name":"The Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gregory J.","family":"Tsongalis","sequence":"additional","affiliation":[{"name":"Dartmouth-Hitchcock Medical Center Lebanon, NH, USA"},{"name":"Geisel School of Medicine at Dartmouth, Hanover, NH, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9462-652X","authenticated-orcid":false,"given":"Konstantinos","family":"Linos","sequence":"additional","affiliation":[{"name":"Dartmouth-Hitchcock Medical Center Lebanon, NH, USA"},{"name":"Geisel School of Medicine at Dartmouth, Hanover, NH, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2021,8,2]]},"reference":[{"key":"bibr1-10668969211031309","doi-asserted-by":"publisher","DOI":"10.1097\/00000478-198707000-00001"},{"key":"bibr2-10668969211031309","doi-asserted-by":"publisher","DOI":"10.1097\/PAS.0b013e31825d532d"},{"key":"bibr3-10668969211031309","doi-asserted-by":"publisher","DOI":"10.5858\/132.11.1813"},{"issue":"1","key":"bibr4-10668969211031309","first-page":"1","volume":"31","author":"Magro G","year":"2016","journal-title":"Histol. 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