In approaching a study of tumors of the bone, one is immediately confronted with a chaos of unsolved problems, pertaining particularly to the osteogenic sarcoma and the giant cell tumor.
Until 1920, when Codman1 instituted the Registry of Bone Sarcoma, the literature was in a state of confusion because of no satisfactory, workable nomenclature. In this country the writers on this subject are conforming more and more to the classification of bone tumors recommended by the registry committee.
In his able and helpful study of the material of the registry, Kolodny2 found fault with the classification adopted by the committee and explained his criticism on the grounds that when the classification was made, the material was not so plentiful as now, and that the personnel of the committee consisted chiefly of laboratory men. He recommended the following classification for the primary malignant tumors of the bone, which is