Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild linear opacities in the lung bases have slightly increased can be increasing atelectasis . No pulmonary edema . Mild cardiac enlargement . Pacer wires in the right atrium and right ventricle . No pleural effusion or pneumothorax .
    OUTPUT:
    
Minimal atelectasis in the lung bases , lungs are otherwise clear .