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Arch Surg. 1920;1(1):23-37. doi:10.1001/archsurg.1920.01110010036003.
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Since the general introduction of roentgen-ray examination of the stomach and intestine after the introduction of barium solution, a great deal of study has been devoted to the subject of diaphragmatic hernia. Many of the cases that before the introduction of the roentgen ray and barium studies could not be diagnosed can now be clearly seen, and definite and accurate diagnoses can be made. This newer method of examination has shown that diaphragmatic hernias are much more common than was formerly believed to be the case. In the days before roentgen-ray examination I was seldom able in my own work to make a definite diagnosis of diaphragmatic hernia. I have recently been able to study with my medical colleagues four of these patients on whom we have subsequently operated. It is my intention to report this clinical experience.

CLASSIFICATION OF DIAPHRAGMATIC HERNIA  Before taking up the details of these cases,


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