Continuous Diaphragm Sign
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References:

1) Marshall GB, Farnquist BA, MacGregor JH. Signs in Thoracic Imaging. J Thorac Imaging
2006;21(1):76-90
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2) Bejvan SM, Godwin JD. Pneumomediastinum: Old Signs and New Signs. AJR
1996;166:1041-1048
[PDF]

3) Zylak CM, Standen JR, Barnes GR. Pneumomediastinum Revisited. Radiographics
2000;20:1043-1057
[PDF]

4) Levin B. The Continuous Diaphragm Sign: A Newly-recognized Sign of Pneumomediastinum.
Clin Radiol 1973;24:337-338
[PDF]

5) Klein DL. Visibility of the Inferior Heart Border in Pneumoperitoneum. AJR 1981;137:622-623
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