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Case Reports in Medicine
Volume 2010 (2010), Article ID 327591, 5 pages
http://dx.doi.org/10.1155/2010/327591
Case Report

Well-Differentiated Extraskeletal Osteosarcoma Arising from the Retroperitoneum That Recurred as Anaplastic Spindle Cell Sarcoma

1Department of Pulmonary Medicine (Surgery), Yokohama City University Medical Center, 4-57 Urafune-cho, Minami-ku, Yokohama, 232-0024, Japan
2Department of Surgery, Yokohama City University School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
3Department of Pathology, Yokohama City University School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
4Department of Pathology and Laboratory Medicine, Kohnodai Hospital, National Medical Center of Japan, 1-7-1 Kohnodai, Ichikawa, Chiba, 272-8516, Japan
5Department of Urology, Yokohama City University School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan

Received 10 November 2009; Accepted 6 January 2010

Academic Editor: Michael Hünerbein

Copyright © 2010 Hiromasa Arai et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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