Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral perihilar alveolar opacities are worrisome for pulmonary edema , underlying infectious process difficult to exclude . Obscuration of the left hemidiaphragm may be due to a small pleural effusion . Cardiac and mediastinal silhouettes are stable . Aorta core valve is noted .
    OUTPUT:
    
Moderate pulmonary edema . Recommend repeat after treatment to exclude underlying infection .