Abstract
Definite changes in the radiographic appearance of the bones are found in renal infantilism. The radiographs show two distinct types of change which I have called the “rachitic” and the “woolly” types. The rachitic type is practically identical with ordinary rickets. The woolly type is characteristic, and is sufficiently typical to be of diagnostic value. The lesions found in this woolly type are asymmetrical, and may be much more marked in one bone than another. The marked deformities in renal infantilism are produced by a collapse of the bone in the metaphysis, which throws the end of the bone out of line.