Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is not engorged . Hazy opacities in the lung bases are compatible with atelectasis . Small right pleural effusion is noted . No pneumothorax is identified . There are no acute osseous abnormalities . No subdiaphragmatic free air is present .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis and trace right pleural effusion . No subdiaphragmatic free air seen .