Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is borderline enlarged . The mediastinal contours are unremarkable . There is perihilar haziness and vascular indistinctness with increased interstitial and alveolar opacities diffusely , but most pronounced in the lung bases compatible with mild to moderate pulmonary edema . No pleural effusion or pneumothorax is clearly demonstrated . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild to moderate pulmonary edema .