患者　男 ,6 6岁。因右上臂包块 1年余 ,逐渐增大而入院。体检 :一般情况良好。右上臂包块明显隆起 ,沿肱骨长轴生长 ,质硬、固定 ,无压痛 ,局部皮温不高 ,无红肿及静脉曲张表现。血清碱性磷酸酶正常。Ｘ线表现 :右肱骨中上段见皂泡囊状膨胀性骨质破坏区 ,病变范围约占肱骨中上 Patient male, 6 6 years old. Due to the right upper arm mass more than 1 year, gradually increased and admitted to hospital. Physical examination: generally good. The right upper arm mass is obviously uplift, along the long axis of the humerus growth, hard, fixed, no tenderness, local skin temperature is not high, no swelling and varicose veins performance. Serum alkaline phosphatase normal. X-ray findings: the right upper humeral see the bubble cystic dilatation of bone destruction area, the lesion in the humerus in the upper and middle