Fig. 2

Histopathology of patient 1’s specimen (hematoxylin and eosin stain). Distinctly, there are abundant fibrous and chondroid matrix with formation of pink homogenous osteoid (Blue arrow, in a, b). Some areas of the tumor show obvious cartilaginous differentiation with well-formed hyaline cartilage (black arrow in a). Most areas of the tumor consist of cellular proliferation of small rounded chondrocytes (blue arrow in d). These cells are focally arranged in cords and trabeculae (c). Based on these findings, patient was diagnosed chondrosarcoma. (a, c: 40×, b, d: 100×)