One of the most important advances in the diagnosis of gastro-intestinal lesions has been the development and application of roentgenographic methods in this field. As is likely to occur when any method is devised which demonstrates new objective signs of disease, certain findings obtained by roentgen-ray studies create new diagnostic problems. Most important of the problems is the significance of roentgen-ray findings and their relative value, to those obtained by other procedures, in the diagnosis of gastric and duodenal lesions. These have been discussed in former communications.1 Our purpose in this paper is to present some of the difficulties and errors into which roentgen-ray findings may lead in relation to the diagnosis of peptic ulcer.
Temporary muscle spasm occasionally produces distortion in the outline of the duodenum or stomach like that produced by an ulcer. An example of this condition is pictured in Figures 1 and 2. In this