Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior study there are new interstitial opacities in the mid lung fields bilaterally , right greater than left . Lung volumes are low , as before . Heart size is moderately enlarged , as before . No large pleural effusion .
    OUTPUT:
    
Increased interstitial opacities bilaterally , right greater than left , representing pulmonary edema . Moderate stable cardiomegaly .