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Figure 3: Histopathology showing infi ltrating round to oval shaped cells with intervening lace-like osteoid and marked pleomorphism. Areas of abnormal cartilage seen. Large areas of necrosis noted. Abnormal mitosis noted (Immunohistochemistry showed tumor cells positive for vimentin and CD68. Negative for Pan cytokeratin (CK), CK20, CD99, SMA, S-100 and Myf-4)

Figure 3: Histopathology showing infi ltrating round to oval shaped cells with intervening lace-like osteoid and marked pleomorphism. Areas of abnormal cartilage seen. Large areas of necrosis noted. Abnormal mitosis noted (Immunohistochemistry showed tumor cells positive for vimentin and CD68. Negative for Pan cytokeratin (CK), CK20, CD99, SMA, S-100 and Myf-4)