Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low , accentuating the cardiac silhouette and bronchovascular structures . There is persistent elevation of the left hemidiaphragm . Adjacent atelectasis of the left lower lobe has slightly improved . Right retrocardiac atelectasis remains unchanged . There are small bilateral pleural effusions .
    OUTPUT:
    
1 . Slight improvement of left basal atelectasis . 2 . Small bilateral pleural effusions .