INTRODUCTION:

Small cell osteosarcoma SCO is a rare sub-type of osteogenic malignant tumors, having the same microscopic features as Ewing sarcoma. However, unlike Ewing’s sarcoma, it is associated with variable degree of osteoid formation. It occurs, mostly, in the metaphysis of long bones (1). Localization on the rib is exceptional and, to the best of our knowledge, only two cases were presented in the literature.