Figure 12b. (a) Radiograph demonstrates a subtrochanteric lytic lesion in the right femur with cortical thickening (arrowheads), endosteal scalloping (small arrows), and chondroid matrix (large arrow), findings that are typical of chondrosarcoma. (b, c) Coronal T1-weighted (b) and axial T2-weighted (c) MR images help suggest a diagnosis of dedifferentiated chondrosarcoma by depicting a large soft-tissue mass (arrows) that was not detectable on the radiograph.