Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph ___ at 08 :47 is submitted .
    OUTPUT:
    
There is increasing opacity at both lung bases which may represent atelectasis , although pneumonia or aspiration should also be considered in the correct clinical setting . There is no pulmonary edema . There is likely a small layering left effusion . No pneumothorax . Overall cardiac and mediastinal contours are stable .