-The CXR demonstrates crescentic lucent air collections below both hemidiaphragms. This is the classic appearance for free peritoneal air on upright views.-Note that the air outlines the inferior border of the diaphragms and the superior border of the liver.
http://eradiology.bidmc.harvard.edu/Classics/item.aspx?section=Emergency+Radiology&labelpk=33f0adab-853f-4010-a0e2-0756b3f1eac5&pk=bae18cd6-95ae-4ee3-abd8-b5ceaaa715eb
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