Results The tumors often located at the diaphysialepiphysial of the os longum and most of them were occured at the lower limb,increasing of the alkaline phosphatase(AKP) was rare.

• 结果临床特征为肿瘤好发于长骨干骺端,下肢多见,少有血清碱性磷酸酶增高。X线、CT特征为溶骨性与膨胀性骨破坏;肿瘤破坏区和软组织肿块内多发小囊变和液-液平面;