Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 20 :31 is submitted .
    OUTPUT:
    
There are increasing bibasilar opacities which could reflect bibasilar pneumonia , atelectasis , or aspiration . Clinical correlation is advised . There is possibly a small layering left effusion . No evidence of pulmonary edema , although the vasculature appears is slightly cephalized which suggests pulmonary venous hypertension . No pneumothorax . Overall cardiac and mediastinal contours are stable .