Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is subtle right mid lung and bilateral lower lobe opacities , best seen on the frontal view , not definitively substantiated on the lateral view , which could be due to infection versus atelectasis . No pleural effusion or pneumothorax is seen . The cardiac silhouette is not enlarged . The aorta is slightly tortuous .
    OUTPUT:
    
Subtle right middle lobe opacity and bibasilar opacities could be due to atelectasis versus infection .