Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are again noted . There is bibasilar atelectasis , with upper zone redistribution . No frank consolidation , overt CHF , or pleural effusion is detected . The cardiomediastinal silhouette is within normal limits for technique and low inspiratory volumes . Slight aortic calcification may be present .
    OUTPUT:
    
Low lung volumes , with bibasilar atelectasis and upper zone redistribution . These findings could be accentuated by low lung volumes . No definite consolidation , though an early infectious infiltrate might be difficult to exclude in this setting .