患者,男,9岁。右胫骨下端无明显诱因疼痛1周,活动时加重,休息后则消失。骨科检查:右胫骨下端轻度压痛,局部无红肿。踝关节活动良好。X线平片检查:右胫骨干骺端外侧局限性骨皮质缺如,病变区骨小梁存在有两个小囊状透明区,其内侧有骨硬化。侧位显示3.8cm×1cm类圆形低密度区,有硬化边, Patient, male, 9 years old. There was no apparent cause of pain in the lower part of the right humerus for 1 week, which increased during the activity and disappeared after the rest. Orthopedic examination: Mild tenderness in the lower right humerus, no local swelling. Ankle activities are good. X-ray examination: The lack of localized cortical bone in the right side of the metaphysis of the right humerus. There are two small cystic-transparent regions in the trabecular bone in the lesion area. Lateral display of 3.8cm x 1cm circular low density area, with hardened edges,