Chondroblastoma, also called Codman tumor, less common Cancer of epiphyseal cartilage, occurred at the termination of endochondral osteogenesis ago. Most occurred in the epiphysis of long bone centers, especially outside the bone-side epiphyseal epiphysis with other major rotor, large nodules, etc. epiphysis. Upper and lower end of femur, tibia long bone, such as upper and lower end of its well site, the vicinity of the incidence of knee accounts for almost half of the total number of tumor.
Can be seen as immature group of medium-sized polygon chondroblastic close at the embedding matrix of cartilage matrix calcification or ossification within the district see. Cancer has spread within the whole range of the giant cell volume. The performance of histology with osteosarcoma or chondrosarcoma confusion. Because of the existence of multinucleated giant cells, but also with the chondromyxoid fibroma or giant cell tumor of confusion.