Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior study , new perihilar and basilar opacities are worrisome for mild to moderate pulmonary edema . Underlying infection and exclude in the appropriate clinical setting , particularly at the left lower lobe . There may also be small pleural effusions posteriorly . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Perihilar and basilar opacities worrisome for mild to moderate pulmonary edema , underlying infection not excluded in the appropriate clinical setting , particularly at the left lower lobe .