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Figure 32: Chest x-ray findings of a pneumopericardium shown as a lucent line around the heart extending up to the main pulmonary arteries (solid white arrows). Air may accumulate inferior to the cardiac shadow, which crosses the midline above the diaphragm, which is said to be diagnostic for pneumopericardium, the so-called continuous diaphragm sign (hollow arrow)

Figure 32: Chest x-ray findings of a pneumopericardium shown as a lucent line around the heart extending up to the main pulmonary arteries (solid white arrows). Air may accumulate inferior to the cardiac shadow, which crosses the midline above the diaphragm, which is said to be diagnostic for pneumopericardium, the so-called continuous diaphragm sign (hollow arrow)