Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Overall lung volumes are low . There are bilateral pleural effusions , and bibasilar atelectasis . New bilateral perihilar opacities , left greater than right , are most consistent with pulmonary edema . Cardiomediastinal silhouette is slightly increased from prior . A left chest wall pacemaker is present , with leads terminating in the right atrium and ventricle . There is no pneumothorax .
    OUTPUT:
    
Small bilateral pleural effusions and adjacent bibasilar atelectasis , with bilateral perihilar opacities are most consistent pulmonary edema , however superimposed pneumonia is difficult to exclude .