Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest film ___ at 13 : 15 is submitted .
    OUTPUT:
    
Interval appearance of moderate perihilar and interstitial edema . Interval appearance of a left pleural effusion . Overall cardiac and mediastinal contours can not be adequately assessed due to marked patient rotation . Given the congestive heart failure , it is difficult to exclude superimposed infection , and therefore , followup imaging would be prudent . No pneumothorax is appreciated .