Fig. 3

Pathological outcomes of the surgery (a). The tumor was composed of confluent proliferating cells in a round and oval shapes, and osteoclast-like multi-nucleated giant cells were scattered throughout the tumor. × 100 (b). Under a high-power microscope, the tumor cells showed up as round cells with a clear boundary, while the cytoplasm was light red in color or transparent with nuclear grooves. A pink cartilage matrix was observed in the tumor cells. × 400