PMC5336710_01
A radiolucent band of air completely surrounding the heart (halo sign)
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F1
A radiolucent area surrounding the heart was observed on chest X-ray (halo sign) (Fig. 1).
Pneumopericardium on computed tomography
AJC-16-66-g002.jpg
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F2
Thoracic computed tomography showed pneumopericardium and pericardial effusion (Fig. 2).