Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker device is noted with leads terminating in the right atrium and right ventricle . Mild to moderate enlargement of cardiac silhouette is present . The aorta is tortuous and calcified . Mild pulmonary vascular engorgement is demonstrated . No large pleural effusion or pneumothorax is seen . Patchy opacities in the lung bases likely reflect areas of atelectasis . Rounded opacity projecting over the seventh and eighth right lateral ribs may reflect callus formation . No definite acute osseous abnormalities detected .
    OUTPUT:
    
Mild pulmonary vascular congestion and bibasilar atelectasis .