Figure 3.

(A) Plain lateral radiograph showing the characteristic ill-defined lesion with both lytic and osteoblastic features and evidence of periosteal elevation (Codman's triangle) (arrow). (B) T1-weighted magnetic resonance image showing the intramedullary extension of the tumour, with cortical destruction and extension into the soft tissue. (C) Lateral and (D) anteroposterior plain radiographs post distal femoral resection and reconstruction of the knee joint with a GMRS (Global modular replacement system, Stryker Howedica) megaprosthesis.