双原发成骨肉瘤一例李家运患者男，１１岁。２０天前骑自行车摔伤右臂。局部红肿，疼痛，夜间尤甚。１０天前砖头击伤左小腿外侧。局部疼痛、略肿，前来就诊。检查：右肱骨上段呈球形增粗，红肿，压痛，局部温度升高，血管轻度露胀。左小腿上段肿胀，压痛明显。胸部透视无... A case of dual primary osteogenic sarcoma Li Jiayun male patient, 11 years old. Twenty days ago, he broke his right arm while riding a bicycle. Local swelling, pain, especially at night. Ten days ago, the brick hit the outside of the left lower leg. Local pain, slightly swollen, come to the clinic. Examination: The upper segment of the right sacrum is spherically thickened, red and swollen, tender, with local temperature rise, and the blood vessels are slightly exposed. The upper leg of the left leg was swollen and tenderness was evident. Chest perspective without...