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Extraskeletal Osteochondroma of the LegA Case Report
Khodamorad Jamshidi, MD1; Mehdi Rezaee, MD1; Haniyeh Kamyab, PharmD1
1 Biotechnology Research Center (H.K.), Department of Orthopaedic Oncology, Shafa Yahyaian Hospital (K.J. and M.R.), Tehran University of Medical Sciences, Baharestan Square, Tehran, Iran 11576-37131. E-mail address for K. Jamshidi: jamshidi_k@yahoo.com
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Investigation performed at the Department of Orthopaedic Oncology, Shafa Yahyaian Hospital, Tehran University of Medical Sciences, Tehran, Iran

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. None of the authors, or their institution(s), have had any financial relationship, in the thirty-six months prior to submission of this work, with any entity in the biomedical arena that could be perceived to influence or have the potential to influence what is written in this work. Also, 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 © 2014 by The Journal of Bone and Joint Surgery, Inc.
JBJS Case Connector, 2014 Feb 12;4(1):e14 1-5. doi: 10.2106/JBJS.CC.M.00169
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Osteochondroma is the most common benign bone tumor. Typically, it arises from the metaphysis of a long bone near the physis during periods of rapid skeletal growth. Less commonly, osteochondroma may originate from the synovium and para-articular regions1. In very rare instances, histologically similar osteocartilaginous lesions occur in soft tissues away from any bone or joint; these are referred to as extraskeletal osteochondromas (ESOCs)2. ESOC is an uncommon, slow-growing, painless osteocartilaginous lesion, with the highest incidence in the hands and feet3. ESOCs have also been reported in the buttocks, the thigh, the skin, the ankle, the knee, the cerebrum, and the nape of the neck. The peak incidence is in the third and sixth decades of life3-7. To the best of our knowledge, ESOC previously has not been reported in the leg. This case report describes an ESOC in the anteromedial portion of the middle third of the left leg.
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    osteochondroma ; leg

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