title: Extraosseous osteogenic sarcoma.
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.
authors.affiliation: Department of Orthopedics and Traumatology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.
authors.forename: Shao-Ying
authors.initials: SY
authors.lastname: Lin
authors.forename: Wei-Ming
authors.initials: WM
authors.lastname: Chen
authors.forename: Hungta H
authors.initials: HH
authors.lastname: Wu
authors.forename: Winby York-Kwan
authors.initials: WY
authors.lastname: Chen
authors.forename: Tain-Hsiung
authors.initials: TH
authors.lastname: Chen
mesh_terms: D000368:Aged; D003131:Combined Modality Therapy; D005260:Female; D006801:Humans; D012516:Osteosarcoma / Q000175:diagnosis / Q000473:pathology* / Q000628:therapy; D012509:Sarcoma / Q000175:diagnosis / Q000473:pathology* / Q000628:therapy