What is conventional osteosarcoma malignant bone tumor?

• Distal femur +++, proximal tibia, proximal humerus, pelvis. • R/O Hematogenous spread (Pulmonary metastases). • Osteolytic, osteocondensing or mixed radiological appearance. • Histological confirmation essential before treatment. • Malignant tumor cell proliferation (atypical osteoblasts) developing, at least centrally with an osteoid matrix formation This tumor can produce malignant cartilage and malignant fibrous tissue. High grade conventionnal Osteosarcoma: ➢Dense proliferation ➢Atypical cells ➢Osteoid matrix formation ; Very important diagnostic element