[Value of compression and change of posture of patients in the gastroduodenal double contrast technique].

The authors perform the upper gastrointestinal examination in order to demonstrate lesions that would not be seen by other radiologic techniques. Due to the progress of Endoscopy in the last years, it is necessary a detailed radiologic examination to reach the diagnostic possibilities that the former did. A good help to do that is the compression in prone dedecubitus with inflatable balloon and the patient's mobilization under radioscopic control.