Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 15 :34 is submitted .
    OUTPUT:
    
There is a stable moderate - sized layering left effusion . Bibasilar airspace opacities , left much greater than right , are again seen likely reflecting lower lobe atelectasis , although pneumonia can not be entirely excluded . There is continued central pulmonary vascular engorgement but there has now been interval appearance of superimposed mild pulmonary edema . No pneumothorax . Stable cardiac and mediastinal contours .