<unk>  (OS) is a rare bone cancer which affects both adolescents and young adults.<unk>  was classified as primary and secondary. Later the the World Health Organization sub-typed as intramedullary/central and surface<unk>  with a number of sub-types under each group.
Osteosarcoma classification
Osteoma classification
Rhabdomyosarcoma classification
Osteochondroma classification
Bone or cartilage mass classification
Malignant fibrous histiocytoma classification
Chondrosarcoma staging
Myxoma classification