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We present the case of a 33\u2010year\u2010old woman with a mass arising from her right hip joint that was examined using a multimodal radiological approach. Because her clinical presentation mimicked that of synovial osteochondromatosis of the hip, surgical dislocation was performed. Histopathological examination of the resected specimen confirmed the diagnosis of localized pigmented villonodular synovitis, with the mass consisting of proliferation of fibrohistiocytic cells, abundant hemosiderin, foamy histiocytes, and occasional giant cells. Because of the presence of tumor necrosis, we hypothesize that torsion of the tumor pedicle was the cause of acute presentation.<\/jats:p>","DOI":"10.1155\/2013\/862935","type":"journal-article","created":{"date-parts":[[2013,11,10]],"date-time":"2013-11-10T10:00:56Z","timestamp":1384077656000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Localized Pigmented Villonodular Synovitis of the Hip: Sudden\u2010Onset Pain Caused by Torsion of the Tumor Pedicle"],"prefix":"10.1155","volume":"2013","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2509-6112","authenticated-orcid":false,"given":"Kiyokazu","family":"Fukui","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ayumi","family":"Kaneuji","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eriko","family":"Kinoshita","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuhei","family":"Numata","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takayuki","family":"Nojima","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tadami","family":"Matsumoto","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2013,11,10]]},"reference":[{"key":"e_1_2_6_1_2","first-page":"731","article-title":"Pigmented villonodular synovitis, bursitis and tenosynovitis","volume":"31","author":"Jaffe H. 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