Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are diffuse interstitial opacities , at least partially due to underlying interstitial lung disease as seen on the prior CT dated ___ . However , superimposed pulmonary edema can not be excluded in the appropriate setting . No pneumothorax . No substantial pleural effusion is seen . Heart size is mildly enlarged . Atherosclerotic calcifications are seen at the aortic arch .
    OUTPUT:
    
Diffuse interstitial opacities at least partially due to underlying interstitial lung disease as seen on the prior CT in ___ , although can not exclude superimposed pulmonary edema .