Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacer is re - demonstrated with leads terminating in the regions of the right atrium and right ventricle . The patient is status post median sternotomy and mitral valve replacement . Mild enlargement of the cardiac silhouette is re - demonstrated . Mediastinal contours are similar with atherosclerotic calcifications noted at the aortic knob . Moderate pulmonary edema persists . A more focal opacity is seen in the right lung base , potentially atelectasis but infection is not excluded . Small bilateral pleural effusions , right greater than left , have slightly increased in size . No pneumothorax is present . Multilevel mild degenerative changes are noted in the thoracic spine . Clips in the upper abdomen are from prior cholecystectomy . Patient is status post left mastectomy and breast implant .
    OUTPUT:
    
Moderate pulmonary edema , similar compared to the previous exam with slight increased size of small bilateral pleural effusions , right greater than left . More focal right basilar opacity could reflect atelectasis though infection is not excluded .