Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is mildly enlarged but stable in size . Pulmonary vascularity is normal . Improving opacity in left retrocardiac region is likely due to atelectasis . Small pleural effusions are present bilaterally . Indwelling devices are unchanged in position .
    OUTPUT:
    
Improving left basilar atelectasis . Small bilateral pleural effusions .