Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right atrial and biventricular pacemaker leads again course in expected position . There is no pneumothorax . Small pleural effusions persist , left greater than right . Lungs remain overinflated , with increased right and stable left lower lobe atelectasis . There has been slight improvement in diffuse interstitial edema . Moderate cardiomegaly and central venous congestion are unchanged .
    OUTPUT:
    
1 . Slightly improved pulmonary edema . 2 . Bibasilar atelectasis .