What are primitive bone tumors?

➢ The classification of primary bone tumors according to the World Health Organization (WHO), counts more than 50 benign and malignant tumor entities. ➢ The name of these tumors is based on: 1. the line of differentiation of the supposed cell of origin: osteoblast / chondrocyte 2. The benign or malignant nature of tumor proliferation: osteoblastoma / osteosarcoma ➢ More common in children ➢ Mainly metaphyseal. ➢ Malignant tumors are rare: the most common primary bone tumor is osteosarcoma (all forms)