Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is moderate enlargement of cardiac silhouette . The aortic knob is calcified . There is mild pulmonary edema which has progressed compared to the previous exam . Small bilateral pleural effusions are noted , with bibasilar airspace opacities , possibly reflecting atelectasis but aspiration or infection can not be excluded . There is no pneumothorax but assessment of the lung apices is limited as the patient 's chin projects over this region .
    OUTPUT:
    
Mild pulmonary edema and small bilateral pleural effusions . Bibasilar airspace opacities may reflect atelectasis but infection or aspiration is not excluded .