Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker device is noted with leads terminating in the right atrium , right ventricle , and coronary sinus . The heart size is mildly enlarged . The aortic knob is calcified . There is mild pulmonary edema with perihilar haziness and vascular indistinctness , new from the prior study . Focal opacities at lung bases may reflect areas of atelectasis though infection can not be excluded . Small bilateral pleural effusions may be present . No pneumothorax is identified .
    OUTPUT:
    
Mild pulmonary edema with probable small bilateral pleural effusions . More focal opacities at lung bases may reflect atelectasis but infection can not be completely excluded .