病例男,15岁,左腿疼痛,自主活动减少月余,局部无红肿,无确切外伤史。影像学检查,CR:左侧股骨远端可见大片状不规则透光区,周围可见轻度骨膜反应,软组织略肿胀(图1)。CT:左侧股骨下段髓腔内限局性骨质破坏,边缘模糊,邻近骨皮质轻度膨胀,其内可见不规则团块状高密度灶,邻近骨皮质 Case of male, 15 years old, left leg pain, reduce voluntary activity more than a month, no local swelling, no exact history of trauma. Imaging examination, CR: The left femur distal irregular large translucent area can be seen around the visible periosteal reaction, soft tissue slightly swollen (Figure 1). CT: The left femoral lower medullary cavity limits the local bone destruction, fuzzy edge, adjacent cortical mild expansion, which can be seen irregular mass-like high-density lesions, adjacent to the cortical bone