Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior exam , the bibasilar consolidations have improved . No new opacity is identified to suggest pneumonia . Small bilateral pleural effusions are unchanged . No pneumothorax is identified . The cardiomediastinal silhouette is mildly enlarged . A left pacemaker with leads in the right atrium and right ventricle is unchanged .
    OUTPUT:
    
Improved aeration at the bilateral bases . No evidence of pneumonia . Unchanged small bilateral pleural effusions .