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What is aortic knuckle?

Q: What is aortic knuckle? What happens if you can't notice it? Also, what happens if the right atrium is enlarged?

A:These are anatomical details which are of no use to the layman except in the context of some illness. The answers are as follows : 1. It is the curvature of the aorta seen in an X-Ray film on the right side of the Cardiac Silhouette. 2. Nothing 3. Nothing unless the patient has a malformation involving some of the other heart chambers.

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