Blue arrow points to "continuous diaphragm sign." The entire diaphragm is visualized from one side to the other because air in the mediastinum outlines the central portion which is usually obscured by the heart and mediastinal soft tissue structures that are in contact with the diaphragm. The red arrow points to the air beneath and posterior to the hearthttp://www.learningradiology.com/archives05/COW%20132-Pneumomediastinum/pneumomedcorrect.htm
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