Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . Again seen is persistent elevation of the right hemidiaphragm . The pulmonary vasculature is normal . Lung volumes are low but improved from the prior study . Streaky opacities at the base of the right and left lung likely represent atelectasis . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Low lung volumes . Persistent elevation of the right hemidiaphragm and streaky opacities at the lung bases most likely representing atelectasis .