Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - chamber pacemaker device is noted with leads terminating in the right atrium and right ventricle . Cardiac silhouette size remains top normal . Mediastinal and hilar contours are unchanged . The aorta is diffusely calcified . There is mild upper zone vascular redistribution with pulmonary vascular indistinctness suggestive of mild pulmonary vascular congestion . Small bilateral pleural effusions are demonstrated . Patchy opacities in the lung bases may reflect atelectasis though infection is difficult to exclude . No pneumothorax is present . No acute osseous abnormality is visualized .
    OUTPUT:
    
Patchy bibasilar airspace opacities , possibly atelectasis though infection is not completely excluded . Mild pulmonary vascular congestion with small bilateral pleural effusions .