trinsic sphincter which is believed to be physiologic rather than anatomic; (2) the pinchcock action of the right crus of the diaphragm which enhances the effect of an intrinsic sphincter; ( ) the acute angle of entry of the esophagus into the stomach; and ( ) an intra-abdominal segment of esophagus.9 In the treatment of hiatal hernia, various surgical procedures have been devised for the restoration of these anatomic features. Some have proven to he more effective than others. It is not our purpose here to evaluate the effectiveness of such treatment, but to show the roentgenologic appearances of the distal
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Teixidor et al. (1973) studied this question.