Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: I doubt significant interval change . Lines and tubes are similar . There is upper zone redistribution without overt CHF and bibasilar atelectasis . No frank consolidation or effusion identified . No pneumothorax detected . Possible mild cardiomegaly . Cardiomediastinal silhouette is probably similar allowing for differences in positioning . Lumbar spine fixation hardware again noted .
    OUTPUT:
    
Doubt significant interval change .