Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly decreased compared to the prior exam . Moderate enlargement of cardiac silhouette persists . The mediastinal contour is unchanged . Calcifications of the aortic knob are again demonstrated . There is mild interstitial pulmonary edema , slightly worse compared to the prior exam . Streaky opacities in the lung bases likely reflect areas of atelectasis . No pleural effusion or pneumothorax is definitively noted . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild interstitial pulmonary edema . Bibasilar atelectasis .