Explain right atrial enlargement, Biology

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Q. Explain Right Atrial Enlargement ?

The right atrium (RA) is a globular chamber, forming the right heart border on the PA view. On the PA view, the border of the enlarged RA should project to the right and its radius of curvature increases. This may cause its border to be atleast half as long as the total height of the right mediastinal border. These changes on the CXR may not be seen, if the heart is positioned leftward or if the chamber enlargement is more in the AP dimension. Fig. 4.10 shows results of RA enlargement.

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