Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the earlier chest radiograph , there is persistent patchy airspace opacity in the left lung base . Blunting of the left lateral costophrenic angles compatible with a fat pad . Increased opacity in the right lower lung likely reflects same process of atelectasis . No evidence of pneumothorax . The cardiomediastinal silhouette is unchanged . Calcified , tortuous thoracic aorta is noted .
    OUTPUT:
    
Bibasilar opacities likely reflecting atelectasis .