Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is top normal . Mediastinal contours are unchanged . There is mild pulmonary vascular engorgement , but this is improved compared to the prior study . No definite pleural effusions are seen . No pneumothorax is seen . Minimal bibasilar patchy opacities may reflect atelectasis . No acute osseous abnormalities are detected .
    OUTPUT:
    
Mild pulmonary vascular congestion , improved compared to the most recent exam , and mild bibasilar atelectasis .