Case Report: PDF OnlyExtraosseous Osteogenic SarcomaLin, Shao-Yinga, d; Chen, Wei-Minga, d; Wu, Hungta H.b, d; Chen, Winby York-Kwanc, d; Chen, Tain-Hsiunga, d, *Author Information aDepartment of Orthopedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan, R.O.C. bDepartment of Radiology, Taipei Veterans General Hospital, Taipei, Taiwan, R.O.C. cDepartment of Pathology, Taipei Veterans General Hospital, Taipei, Taiwan, R.O.C. dInstitute of Surgery, National Yang-Ming University School of Medicine, Taipei, Taiwan, R.O.C. *Correspondence to: Dr. Tain-Hsiung Chen, Department of Orthopedics and Traumatology, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei 112, Taiwan, R.O.C. E-mail: [email protected] Received: June 18, 2004 • Accepted: December 23, 2004 Journal of the Chinese Medical Association: November 2005 - Volume 68 - Issue 11 - p 542-545 doi: 10.1016/S1726-4901(09)70091-7 Metrics Abstract Extraosseous osteogenic sarcoma is a very rare malignant neoplasm. Out of the more than 400 cases of soft tissue sarcomas on file in our hospital, only 2 were extraosseous osteogenic sarcomas. Both were situated in the thigh. The first case was initially diagnosed as a hematoma and treated by marginal excision. The diagnosis of high-grade osteosarcoma primarily arising in soft tissue was made from histopathologic examination. Radiotherapy of 60 Gy in 30 fractions was given postoperatively. The second patient, primarily diagnosed as having a soft tissue sarcoma, was treated by wide excision. The final pathologic report was high-grade extraosseous osteogenic sarcoma. Adjuvant chemotherapy was given postoperatively. Both patients are alive without local recurrence and distant metastasis at postoperative 90-month and 107-month follow-up, respectively. © 2005 by Lippincott Williams & Wilkins, Inc.