骨肉瘤是最常见的原发性恶性骨肿瘤 ,通常好发于四肢长骨 ,偶发于扁骨、不规则骨 ,骨外更少见。发生于上、下颌骨的骨肉瘤占所有部位骨肉瘤的 5 .1% [1] 。本组共收集 9例发生于上、下颌骨 ,经手术、病理证实的骨肉瘤 ,现报告如下。1　临床资料本组 9例 ,男 5例 ,女 4例 ;年龄 Osteosarcoma is the most common primary malignant bone tumor, usually occurs in the long bones of extremities, occasionally in the flat bones, irregular bones, bone is more rare. Occurred on the mandibular osteosarcoma accounted for 5.1% of all parts of osteosarcoma [1]. This group were collected in 9 cases occurred in the upper and lower jaw bone, the operation, pathological confirmed osteosarcoma, are as follows. 1 Clinical data The group of 9 patients, 5 males and 4 females; age