Fig. 4.

Primary malignancy in giant cell tumor of Bone. (Fig. 4-A) and (Fig. 4-B) came from one case. (Fig. 4-C) and (Fig. 4-D) came from another case. (Fig. 4-A) and (Fig. 4-C) showed the classical giant call tumor respectively (Fig. 4-B). Illustrated the spindle cell sarcoma, mitosis was obviously visible. (Fig. 4-D) Demonstrated the osteosarcoma, the residual giant cells and classical giant cells tumor region adjacent to osteosarcoma area (H&E × 200).