Chondroblastoma of bone

We studied 25 cases chondroblastoma of bone predominant affecting young males，usually those in the second and third decade of life (82%).The ends of long bones were the moat com-monly involved (72%)and the femur was the bone most commonly affected (55%). The classically histologic appearance is that of a combination of chondroblastic cells and osteoclastlike giant cells，chondroid differentiation or calcification must be identified. The incidence,diagnosis and dif-ferentied diagnosis of cnondroblastoma are discussed.