Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes , which results in bronchovascular crowding . Mild bibasilar atelectasis is seen . There has been interval improvement in the previously described bilateral diffuse opacities consistent with improving edema . Mild pulmonary edema remains . The heart remains enlarged . No pneumothorax .
    OUTPUT:
    
Mild pulmonary edema .