Assertion: mediastinum's esophagus | /r/HasProperty | figure 1
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Source sentences:
text: The radiographic signs of pneumomediastinum primarily involve increased visibility of normal mediastinal anatomy, including being able to distinctly visualize the dorsal and ventral walls of the esophagus and trachea (Figure 1), or increased visibility of individual great vessels such as the cranial vena cava, major branches of the aortic arch, and the azygos vein.