Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are redemonstrated . The heart size is normal . There is crowding of the bronchovascular structures . Minimal atelectasis is noted in the lung bases , with small bilateral pleural effusions , similar when compared to the prior study . No new focal consolidation , or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild bibasilar atelectasis and small bilateral pleural effusions , not substantially changed when compared to the prior exam .