Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left pectoral pacemaker and its leads are in unchanged positions . There is new left lung base opacity in the retrocardiac region , likely reflecting left lower lobe atelectasis . There are probable small bilateral pleural effusions . Right lung base atelectasis is increased . New opacity in the right upper lung may reflect asymmetric pulmonary edema . Moderately enlarged cardiac silhouette is similar to before . Focal deformity at the right first rib is unchanged .
    OUTPUT:
    
1 . New right upper lung opacity may reflect asymmetric pulmonary edema in setting of acute mitral valve regurgitation , however pneumonia or hemorrhage is possible in correct clinical setting . 2 . Increased bibasilar atelectasis small pleural effusions .