Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar bronchovascular crowding with exaggeration of the heart contour is due to low lung volumes . Under those circumstances , the lungs are otherwise clear . Mediastinal contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
There are no significant cardiopulmonary findings except for low lung volumes .