Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral radiographs of the chest were obtained . Lungs are slightly lower in volume than on the previous examination with interval increase in its interstitial opacity which suggests mild pulmonary edema . In this context , subtle pneumonia could be obscured . The heart remains mildly enlarged with tortuous aorta .
    OUTPUT:
    
Changes of emphysema with mild superimposed pulmonary edema . If continued concern for pneumonia , consider diuresis and repeat imaging .