男性患儿,10岁。主诉双前臂肿块近4年。查体:左前臂可触及不规则肿块,无红肿压痛,推压无移动,与皮肤无粘连,左前臂明显短缩畸形。腕关节和肘关节活动障碍。右前臂及双膝关节邻近骨质可触及不规则无痛性硬质肿块。患儿父亲41岁,在其左股骨远端、胫腓骨近端、双腕关节及右肩胛骨 Male child, 10 years old. Composed of double forearm tumor nearly 4 years. Physical examination: the left forearm can reach the irregular mass, no swelling and tenderness, no movement of the push, no adhesion with the skin, left forearm significantly shortened deformity. Wrist and elbow mobility disorders. Adjacent to the right forearm and bilateral knees bone can reach irregular painless hard mass. Children with their father 41 years old, in the left femur, proximal tibiofibular, wrist and right scapula