Fig. 2

After neoadjuvant chemotherapy. a CT axial image (bone condition). Periosteal reaction was detected prior to chemotherapy. b, c Gadolinium contrast MRI; (b) axial and (c) coronal images. The soft tissue extension of the tumor shrunk remarkably and a small enhanced lesion was detected in the radius and intraosseous membrane. The dotted arrow indicates the resection range including the radius, intraosseous membrane, and pronator quadratus muscle. The dotted line indicates the osteotomy line of the radius