Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is accentuated due to the presence of low lung volumes and appears top normal in size . Mediastinal contour appears slightly widened superiorly , likely due to low lung volumes and supine AP technique . There is crowding of bronchovascular structures likely due to low lung volumes without overt pulmonary edema . Patchy opacities in the lung bases may reflect areas of atelectasis . No pleural effusion or pneumothorax is clearly noted on this supine exam . No displaced fractures are seen .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis .