Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The moderately enlarged cardiac silhouette is unchanged . There is interval decrease of the previous severe pulmonary edema , with now symmetric moderate perihilar edema . There is no pneumothorax or pleural effusion . The underlying osseous structures are grossly unremarkable .
    OUTPUT:
    
1 . Moderately enlarged cardiac silhouette , unchanged . 2 . Interval moderate decrease of pulmonary edema , with now symmetric moderate perihilar edema . Superimposed infectious process can not be excluded .