Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded and clear . There is continued right atrial enlargement , as seen on the prior CT . The hilar and pleural surfaces are unremarkable . Apparent foreshortening of the distal right clavicle is likely due to rotated position on the PA image .
    OUTPUT:
    
Mild right atrial enlargement . Lungs are clear .