Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild to moderately severe interstitial pulmonary edema has improved since ___ . Mildly enlarged heart size is unchanged . Mediastinal and hilar contours are stable . There are no discrete lung opacities concerning for an superadded or coexisting pneumonia . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild to moderately severe interstitial pulmonary edema has improved since ___ . Mildly enlarged heart size is stable .