The extensive use of the roentgen-ray as an integral part of our diagnostic armamentarium has resulted among other things in an increase in the number of cases of diaphragmatic hernia reported in the literature of the past few years. This increase has not been due to a greater incidence of the condition, excluding those occurring during the late war, but to a more general use of the roentgen-ray together with improved technic of the roentgenologist. While it is not a common condition, still diaphragmatic hernia is probably not as rare as it was believed to be a few years ago. It may occur in two forms, congenital or traumatic. Congenital hernia is subdivided into true and false, the former being characterized by the presence of a hernial sac and the latter by its absence. The traumatic form is practically always without a sac. The size of the hernial opening may