Figure 7b. Anteroposterior (a) and lateral (b) radiographs of the tibia reveal a lytic and sclerotic lesion in the tibial diaphysis with cartilage matrix (arrows in b), a finding that is indicative of a chondrosarcoma. Thick, solid, unilaminar periosteal new bone (arrowhead in a), which is characteristic of a low-grade chondrosarcoma, is seen adjacent to a more superior area of spiculated new bone (arrow in a), a finding that is suggestive of a more aggressive tumor type.