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Although the entire heart is enlarged, a double contour is seen through the right side of the heart. The more medial line is the enlarged left atrium (white dotted line) and the heart border is more lateral (blue dotted line).
The size of the left atrium (blue arrow) measured from the mid point of the left main bronchus (yellow dotted line) to the mid point of the double density line (white dotted line) is clearly more than 7cm.
The subcarinal angle (yellow solid line) is also enlarged, much more than the upper limit of normal taken to be 90-100 degrees.