作者报告2例下肢骨肉瘤并推断有淋巴结转移的病例。例1:8岁女孩,最初X线检查和骨活检确诊为右胫骨干骺端骨肉瘤,八个月后行膝假体替代术。术后一年复查,右髂窝有一无症状肿块。超声检查盆腔发现4cm直径钙化肿块。CT显示盆腔 The authors report two cases of lower extremity osteosarcoma and inferred cases of lymph node metastases. Example 1: An 8-year-old girl was initially diagnosed with osteosarcoma of the right humeral metaphysis by X-ray and bone biopsy, and knee prosthesis replacement was performed eight months later. One year after surgery, there was an asymptomatic mass in the right armpit. A 4-cm diameter calcified mass was found on the pelvic sonography. CT shows pelvic cavity