Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are unchanged , with the heart size within normal limits . Emphysema is again seen within the lungs . There are linear opacities in both lung bases compatible with atelectasis . Small bilateral pleural effusions are likely slightly decreased in size . There is no pneumothorax . No acute osseous abnormalities are visualized .
    OUTPUT:
    
Small bilateral pleural effusions , possibly decreased from the prior exam , with mild bibasilar atelectasis .