Although in this area malignant bone tumors have a marginal incidence, knowledge conducent 10 early detection and prompt management has prognostic value. The purpose of this paper is to point out the local experience with these pathologies, and to establish comparisons with other areas ofthe word.

This is a retrospective study in which 79 patiens, age less than 20 years, and with a diagnosis ofprimary malignant bone tumors, took partoTen non-biopsied cases were eliminated. Fifty-four osteosarcomas, 11 Ewing s sarcomas, 3 Giant cell tumors and 1 condrosarcoma. Out of this group, only 4% remained disease-free for 2 years, a survival population 20% less than wath is achieved elsewhere . Otherwise, we found no major differences between our findings and the literature on this matter.