Although the importance of the Roentgen ray in the diagnosis of pulmonary tuberculosis has for some time been recognized, it is only within the last year that the possibilities of its use in the diagnosis of other pulmonary conditions has been developed.
Pneumonias showing few physical signs, due to their location and to the slight amount of lung tissue involved, serous and purulent exudates, abscess of the lung, hyperplasia of bronchial lymph-nodes, pneumothorax, as well as miliary tuberculosis, are now visibly demonstrated where formerly their existence was largely a matter of conjecture.
In the children's service at the Roosevelt Hospital, roentgenograms are taken of all pneumonias, not only in obscure cases for diagnosis, but also to determine associated conditions and the extent of active processes.
The cases reported illustrate the value of its aid in these various conditions.
The first roentgenogram (Fig. 1) shows a practically normal chest. The slight