Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate mild cardiac enlargement an calcification of the aortic knob , unchanged . Diffusely increased opacity is compatible with mild pulmonary edema . No definite focal consolidation , pleural effusion , or pneumothorax is seen . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Mild pulmonary edema .