Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and cardiomediastinal contours are within normal limits for age . Probable background hyperinflation . Interstitial markings appear chronic . No CHF , focal consolidation , pleural effusion , or pneumothora detected . No free air seen beneath the diaphragm .
    OUTPUT:
    
Bibasilar atelectasis . No focal consolidation or effusion . No CHF .