Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . Ill - defined opacities in the right lower lung are not well seen on the lateral projection and likely represent mild atelectasis , although infection can not be excluded . The lungs are otherwise clear . The heart is mild to moderately enlarged . The mediastinal contours are normal . There are no pleural effusions . No pneumothorax is seen . Mild wedging of a lower thoracic vertebral body is noted . Note is made of a left side pacemaker with right atrial and ventricular leads .
    OUTPUT:
    
1 . Mild right lower lung atelectasis , less likely infection . 2 . Mild to moderate cardiomegaly .