Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes with resultant bronchovascular crowding . There is bibasilar atelectasis , left greater than right . Cardiomediastinal and hilar contours are unchanged . No pneumothorax or pleural effusion .
    OUTPUT:
    
Bibasilar atelectasis , left greater than right .