Fig. 1

Image features of chondrosarcoma in the metaphysis of the distal femur. Nineteen-year-old female patient with chondrosarcoma. a, b X-ray indicated a large osteogenic bone lesion at the posterior femur of the left leg. c MRI enhanced scan showing the lesion was closely adjacent to the popliteal vessels. d Cross-section of CT scan demonstrated that the lesion was close next to the vessels