title: A case of extra-osseous osteosarcoma.
abstract: The authors report a case of extra-osseous osteosarcoma of the thigh. They review the literature and emphasize the rarity of this highly malignant neoplasm. It was treated by wide surgical excision associated with adjuvant radiotherapy and chemotherapy. A month later a metastasis appeared in the lung which was not amenable to treatment. The differential diagnosis and histological features are discussed.
mesh_terms: D000368:Aged; D003131:Combined Modality Therapy; D006801:Humans; D008175:Lung Neoplasms / Q000473:pathology / Q000556:secondary / Q000628:therapy; D008297:Male; D012516:Osteosarcoma / Q000473:pathology* / Q000556:secondary / Q000628:therapy; D012983:Soft Tissue Neoplasms / Q000473:pathology* / Q000628:therapy; D013848:Thigh