目前儿童肢体的软组织肉瘤采用的治疗方法为手术切除、放疗和化疗。放疗可影响生长期之长骨骺板、干骺端且使放疗部位的骨髓成份受到仰制;化疗也可造成骨髓抑制导致贫血和中性白细胞减少症,但化疗又反过来刺激了四肢造血骨髓的再生。MR成像可显示骨及骨髓并为诊断和治疗相关的表现提供重要的监控手段。作者报道了2例滑膜肉瘤;1例骨外尤文氏瘤综合治疗效果的MR表现。3例儿童 The current treatment of soft tissue sarcoma of limbs in children is surgical resection, radiotherapy and chemotherapy. Radiotherapy can affect the growth of the long epiphyseal plate, the metaphysis and radiotherapy sites of bone marrow components are Yang system; chemotherapy can also cause bone marrow suppression lead to anemia and neutropenia, but chemotherapy in turn stimulate the limbs of the bone marrow regeneration. MR imaging shows bone and bone marrow and provides an important monitoring tool for diagnosis and treatment-related performance. The authors reported two cases of synovial sarcoma; one case of Ewing’s extracranial composite treatment of MR results. 3 cases of children