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![Primary malignant tumors of bone surface: a review with emphasis in differential diagnosis](https://image.oaes.cc/4f8d375d-83b7-45e8-b9f3-0673d41b4f2f/3818.fig.5.jpg)
Figure 5. CT scan shows a tumor that develops in the soft tissue but starts from the cortex (A); High-grade surface osteosarcoma of distal femur with cortical erosion (B); Infiltrating neoplasm in the surrounding soft tissues (H&E;25X) (C); Highly atypical features and osteoid production (H&E; 50X) (D)