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Uptodate Reference Title
Free air and air-fluid level on x-ray
Free air and air-fluid level on x-ray
An A-P x-ray (A) shows free air under the diaphragm, a well-defined liver edge (dashed arrow), but no obvious free fluid. A lateral examination (B) shows an air fluid level (arrowhead) that was not obvious on the A-P examination. The free air above (arrow) outlines the liver edge with greater clarity (dashed arrow).