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A 69-year-old male patient visited our outpatient department for treatment of an enlarged, palpable mass in the right lower quadrant (RLQ). Computed tomography showed a 15-cm multilobulated, heterogeneous, enhanced mass in the RLQ, which we suspected originated from the colon. He underwent a right hemicolectomy, and the pathologic result was a colon mesenteric UPS. We report a rare case of a primary UPS of the colon mesentery and discuss the characteristics of this neoplasm in reference to the literature.<\/jats:p>","DOI":"10.3393\/ac.2018.03.11","type":"journal-article","created":{"date-parts":[[2019,5,30]],"date-time":"2019-05-30T08:48:27Z","timestamp":1559206107000},"page":"152-154","update-policy":"https:\/\/doi.org\/10.3393\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Primary Undifferentiated Pleomorphic Sarcoma of the Colon Mesentery"],"prefix":"10.3393","volume":"35","author":[{"given":"Joo Hyun","family":"Lee","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dong Baek","family":"Kang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2389-5738","authenticated-orcid":true,"given":"Won Cheol","family":"Park","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1975","reference":[{"key":"ref1","volume-title":"","author":"Fletcher","year":"2002"},{"key":"ref2","doi-asserted-by":"publisher","DOI":"10.1002\/1097-0142(196303)16:3<331::AID-CNCR2820160307>3.0.CO;2-F"},{"key":"ref3","doi-asserted-by":"publisher","DOI":"10.1002\/1097-0142(197806)41:6<2250::AID-CNCR2820410626>3.0.CO;2-W"},{"key":"ref4","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijscr.2016.06.025"},{"key":"ref5","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-5347(17)45507-8"},{"key":"ref6","doi-asserted-by":"publisher","DOI":"10.3348\/jkrs.2007.57.6.549"},{"key":"ref7","doi-asserted-by":"publisher","DOI":"10.1002\/jso.20972"},{"key":"ref8","doi-asserted-by":"publisher","DOI":"10.1155\/2015\/532656"},{"key":"ref9","first-page":"1061","volume-title":"Tumor cells of malignant fibrous histiocytomas express mRNA for laminin","author":"Soini","year":"1991"},{"key":"ref10","doi-asserted-by":"publisher","DOI":"10.1634\/theoncologist.10-10-833"}],"container-title":["Annals of Coloproctology"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/coloproctol.org\/upload\/pdf\/ac-2018-03-11.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/coloproctol.org\/journal\/view.php?doi=10.3393\/ac.2018.03.11","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/coloproctol.org\/upload\/pdf\/ac-2018-03-11.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,5,13]],"date-time":"2021-05-13T04:26:30Z","timestamp":1620879990000},"score":1,"resource":{"primary":{"URL":"http:\/\/coloproctol.org\/journal\/view.php?doi=10.3393\/ac.2018.03.11"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,6,30]]},"references-count":10,"journal-issue":{"issue":"3","published-print":{"date-parts":[[2019,6]]}},"URL":"https:\/\/doi.org\/10.3393\/ac.2018.03.11","relation":{},"ISSN":["2287-9714","2287-9722"],"issn-type":[{"value":"2287-9714","type":"print"},{"value":"2287-9722","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,6,30]]},"assertion":[{"value":"2018-01-04","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2018-03-11","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2019-05-31","order":2,"name":"published","label":"Published online","group":{"name":"publication_history","label":"Publication History"}},{"value":"2019-06-30","order":3,"name":"published","label":"Print publication","group":{"name":"publication_history","label":"Publication History"}}]}}