Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes with resulting bronchovascular crowding . There has been interval decrease in the amount of atelectasis at the bilateral bases , although some mild atelectasis is still present . The cardiomediastinal and hilar contours are unchanged . A right - sided internal jugular central venous line ends at the mid SVC .
    OUTPUT:
    
Interval improvement of atelectasis at the bilateral bases .