Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest film ___ at 01 :43 is submitted .
    OUTPUT:
    
There has been interval appearance of mild pulmonary and interstitial edema . In addition , there is increasing consolidation in the retrocardiac region which would be concerning for aspiration pneumonia . There is likely a small left effusion . No pneumothorax . Overall cardiac and mediastinal contours are unchanged . Stimulator generators overlie both upper lungs limiting evaluation in this vicinity .