An<unk>  is a benign (noncancerous) tumor that develops during childhood or adolescence. It is an abnormal growth that forms on the surface of a bone near the growth plate. Growth plates are areas of developing cartilage tissue near the ends of long bones in children. Bone growth occurs around the growth plate, and when a child becomes full-grown, the growth plates harden into solid bone. An<unk>  is an outgrowth of the growth plate and is made up of both bone and cartilage. As a child grows, an<unk>  may grow larger, as well.
Osteochondroma
Osteochondrosis
Osteoma
Osteoblastoma
Osteoid osteoma
Osteosarcoma
Synovial sarcoma
Aneurysmal bone cyst