In spite of the many excellent publications on tumors of bone in the recent literature, the average surgeon is puzzled as to the diagnosis and treatment. A review of some of the cases which we have observed convinces us that there is good reason for bewilderment.
We gather from the writings of different men that there are three general approaches to a diagnosis of the type of any bone tumor. The clinical course, with the known age incidence of the various kinds of neoplasm, the location in the bone and the slowness or rapidity of growth give us the first lead toward the solution. The second factor which is of material assistance is a correctly interpreted roentgenogram, the large proportion of tumors giving characteristic appearances. Lastly, the diagnosis may be clinched by a microscopic study, either by means of a frozen section at the time of operation or by more