Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest ___ at 18 : 14 is submitted .
    OUTPUT:
    
The heart remains enlarged which may reflect cardiomegaly or pericardial effusion . Overall mediastinal contours are stable . There continues to be mild to moderate pulmonary and interstitial edema . There is likely a layering left effusion . No pneumothorax is seen .