Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - chamber pacemaker with leads terminating in the right atrium and right ventricle is unchanged . The heart is mild to moderately enlarged , with mild pulmonary vascular congestion noted . Diffuse atherosclerotic calcifications of the aorta are seen . Retrocardiac opacity may reflect atelectasis or infection . Small left pleural effusion is relatively similar compared to the prior study , as is a tiny right pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Mild pulmonary vascular congestion with small bilateral pleural effusions , left greater than right . Retrocardiac opacity may reflect atelectasis though infection is difficult to exclude .