Which radiographic features are most characteristic of chondrosarcoma?

Which radiographic features are most characteristic of chondrosarcoma?

• A. Destroyed cortical bone with diffuse mottled calcification and indistinct border
• B. Sunburst pattern with reactive bone formation
• C. Onion skin periosteal reaction
• D. Ground-glass appearance

Answer: (A)

Chondrosarcoma tends to produce a destructive lesion in the bone with calcified cartilage matrix and an ill-defined margin as it invades surrounding bone and soft tissues. The combination of cortical destruction, internal calcifications from a cartilaginous matrix, and a poorly defined border is classic for a malignant cartilaginous tumor, i.e., chondrosarcoma. In contrast, the other patterns point to different diagnoses: a sunburst pattern with aggressive periosteal reaction is more typical of osteosarcoma; onion-skin layering of the periosteum suggests Ewing sarcoma; a ground-glass appearance is characteristic of fibrous dysplasia.

Chondrosarcoma tends to produce a destructive lesion in the bone with calcified cartilage matrix and an ill-defined margin as it invades surrounding bone and soft tissues. The combination of cortical destruction, internal calcifications from a cartilaginous matrix, and a poorly defined border is classic for a malignant cartilaginous tumor, i.e., chondrosarcoma.

In contrast, the other patterns point to different diagnoses: a sunburst pattern with aggressive periosteal reaction is more typical of osteosarcoma; onion-skin layering of the periosteum suggests Ewing sarcoma; a ground-glass appearance is characteristic of fibrous dysplasia.