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Intra-Articular Metastasis of Lung Carcinoma Presenting as Pigmented Villonodular Synovitis of the KneeA Case Report
J.A.J. Mutch, MDCM1; Josee Doyon, MD, FRCSC2; S. Mottard, MD, FRCSC2
1 Recherche Clinique en Orthopédie, Hôpital Sacré Coeur de Montréal, 5400 Boulevard Gouin Ouest, C-2095, Montréal, QC H4J 1C5, Canada. E-mail address: twosoccio@gmail.com
2 Département de Pathologie (J.D.) and Département d’Orthopédie (S.M.), Pavillon Rachel-Tourigny, Hôpital Maisonneuve-Rosemont POES, Bureau #RT-1142, 5305 Boulevard l’Assomption, Montréal, QC H1T 2M4, Canada
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Investigation performed at Hôpital Maisonneuve-Rosemont, Montréal, Québec, Canada

Disclosure: None of the authors received payments or services, either directly or indirectly (i.e., via his or her institution), from a third party in support of any aspect of this work. One or more of the authors, or his or her institution, has had a financial relationship, in the thirty-six months prior to submission of this work, with an entity in the biomedical arena that could be perceived to influence or have the potential to influence what is written in this work. No author has had any other relationships, or has engaged in any other activities, that could be perceived to influence or have the potential to influence what is written in this work. The complete Disclosures of Potential Conflicts of Interest submitted by authors are always provided with the online version of the article.

Copyright © 2013 by The Journal of Bone and Joint Surgery, Inc.
JBJS Case Connector, 2013 May 08;3(2):e41 1-5. doi: 10.2106/JBJS.CC.L.00249
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Pigmented villonodular synovitis (PVNS) is a rare, benign neoplastic process involving joint synovium1,2. (Note that, although the term pigmented villonodular synovitis is commonly used, the current preferred term is diffuse tenosynovial giant-cell tumor.) PVNS can be local or diffuse. The most commonly affected joint is the knee (75% of PVNS cases involve the knee)3. Presenting symptoms are often vague and can include pain, joint effusion, mechanical locking, or a palpable mass4.
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