Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest film ___ at 14 :32 is submitted .
    OUTPUT:
    
Overall cardiac and mediastinal contours are stably enlarged . There is a small right basilar and lateral pleural effusion . The overall interstitium is somewhat prominent , particularly in the right mid and lower lung , but this does not appear to be significantly changed since ___ . Given that the left lung appears grossly clear , this more likely represents an infectious process rather than edema . Clinical correlation , however , is advised . No pneumothorax .