Signs of left atrial enlargement on the chest X ray

What are the signs of left atrial enlargement on the chest X ray?

Cardiac chamber enlargement can generally be identified by increased prominence of convexity of the corresponding heart border. In particular, left atrial enlargement causes a posterior bulging of the superoposterior heart border. On the frontal chest radiograph, signs of left atrial enlargement include enlargement of the left atrial appendage, “splaying” of the carina and elevation of the left main stem bronchus, and a “double density” projecting over the central portions of the heart, sometimes extending toward the right 

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