A. Telangiectatic foci with several septae composed of large, bizarre cells (×100, H&E). B. Poorly differentiated sarcomatous tumor composed of large anaplastic cells (×200, H&E). C. Spicules of osteoid and bone between malignant cells (×200, H&E). D. Transition areas between loose osteoid and cartilage (×100, H&E).