Primary tumors of the rib are relatively uncommon in adults and rare in children. In this article, we present a case who was operated due to conventional osteosarcoma of the rib in the light of the literature review. A 17-year-old female patient had been operated due to a rib tumor 54 months ago. There was no local recurrence or metastatic disease. Chest wall tumors, particularly those arising from bones, require histologic assessment to be considered benign; the differential diagnosis of malignant neoplasms should not be based on clinical and radiographic features, only.