Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker device is again noted with leads terminating in the right atrium and right ventricle . Moderate enlargement of the cardiac silhouette is again noted . The aorta remains tortuous . Mediastinal and hilar contours are somewhat . Mild pulmonary vascular congestion is noted with patchy bibasilar opacities , left greater than right , likely reflective of atelectasis , but infection can not be excluded in the left lung base . No pleural effusion or pneumothorax is identified . No acute osseous abnormality is seen . Surgical clips are again noted at the thoracic inlet suggestive of prior thyroid surgery .
    OUTPUT:
    
Mild pulmonary vascular congestion . Probable bibasilar atelectasis however infection in the left lung base can not be completely excluded