Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable upright radiograph of the chest demonstrates interval resolution of the heterogeneous right lower lobe opacity . There is persistent bilateral lower lobe atelectasis . The lungs are otherwise clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . Calcification of the aortic arch is noted .
    OUTPUT:
    
1 . Interval resolution of right lower lobe consolidative opacity . 2 . Persistent bilateral lower lobe atelectasis . 3 . No evidence of congestive heart failure or mediastinal enlargement .