骨肉瘤是原发于骨的肿瘤中最常见的一类恶性肿瘤，转移快，死亡率高。
Osteosarcoma is one of the commonest primary malignant tumors of bone. It metastasizes fast, and has a high death rate.
经典型骨肉瘤是原发于髓腔内的高度恶性肿瘤，肿瘤细胞产生骨样组织，可能是极少量。
Conventional osteosarcoma is a primary intramedullary high grade malignant tumor in which the neoplastic cells produce osteoid, even if only in small amounts.
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