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Osteosarcoma is a rare malignant tumor of the mesenchymal tissue that accounts for 5% of all malignant tumors in children and teenager. The purpose of our study was to describe the epidemiological and evolutionary characteristics of osteosarcoma in Tunisia.Methods: It's a retrospective study performed in the Oncology Department of Salah Azaiez Institute from January 1980 to December 2016. We analyzed records of 200 cases of patients with primary high-grade osteosarcoma.Results: The meandoi:10.31557/apjcc.2018.3.4.81 fatcat:zcff57qrrbfd5ayxpdbiy7oane