1　病例介绍患者张宏伟,男性,23岁,学生。因右小腿前部肿痛2个月入院。该患入院前6个月,踢足球时曾碰伤右小腿前部中上1/3处,1个月后自愈。入院前2个月,患者自感碰伤处疼痛,并有肿胀,无发红、发热现象,偶有低热、盗汗,食欲尚可,曾在外院诊断为“右胫骨上中1/3处肿瘤”。入院检 1 case introduction patient Zhang Hongwei, male, 23 years old, student. Due to the right lower leg anterior swelling and pain 2 months admitted. The patient admitted to hospital 6 months before, hit the front of the right lower leg when playing football in the upper 1/3, 1 month after healing. Two months prior to admission, the patient felt pain and had swelling, redness and fever on his own. He had occasional fever, night sweats and an appetite. He was diagnosed in the outpatient department as “one-third of the tumors in the right tibia ”. Hospitalization