This is an analysis of 550 bone tumors (308 males - 204 females, at the ages from 0 to 20) treated at the Department of Orthopaedic and Oncology, Center for Traumatology & Orthopaedics, Hochiminh City from 1985 to 1998 to study the incidence of bone tumors in children & adolescents and to propose the algorithm for early detection and diagnosis.