RT Journal T1 ROentgen diagnosis of the extremities and spine JF Journal of the American Medical Association JO Journal of the American Medical Association YR 1949 FD October 8 VO 141 IS 6 SP 423 OP 423 DO 10.1001/jama.1949.02910060061027 UL http://dx.doi.org/10.1001/jama.1949.02910060061027 AB This edition has been increased by 77 pages over the original edition. The first sixteen chapters are in all essence the same as the original volume. This applies both to text and to illustrations. There are only a few minor changes in the text. Chapters 17 and 18, however, are valuable new additions to this volume and the subject. Chapter 17 is a new chapter on specific tumors. This deals with the radiologic aspects of diagnosis in such a manner as to emphasize probabilities based on certain groupings, for example, according to age; seat of tumor, such as the humerus or femur; site of tumor, such as medullary or subperiosteal, and other characteristics. The author's approach should be of assistance to the radiologist, reducing probabilities in the diagnosis of specific cases. The eighteenth chapter deals with primary bone malignancy. It discusses the radiologic characteristics of primary lesions in an effort