Bone tumors are rare tumorsaccounting for less than .2% of all cancers Occur more in young ages . Classification of Bone tumors. Origin: - primary - secondary: 95%, breast, lung, prostate, kidney and thyroid cell type: Bone? Osteoma, osteosarcoma Cartilage? Chondroma, Chondrosarcoma Marrow? Hemangioma, angiosarcomaFibrous tissue?Fibroma, fibrosarcomaTumor type:Benign: Osteoma, osteochondromaMalignant:: Osteosarcoma, chondrosarcoma .