There are about a dozen x-ray findings, but two of them are especially important: Loss of the aortic knob/aortic-pulmonary window and the calcium sign.


Look for a white line of calcium within the aortic knob. Then measure the distance from there to the outer edge of the aortic knob.


A distance >0.5cm is considered a positive calcium sign and a distance >1.0cm is considered highly suspicious for aortic dissection.


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