Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest was obtained . Interstitial edema is mild , with Kerley B lines , and has increased since the prior exam . Coarse interstitial lung markings are consistent with chronic mycobacterium avium intracellulare infection and emphysema . No pleural effusion , pneumothorax , or focal consolidation . Mild cardiomegaly and cardiomediastinal contours are stable . No radiopaque foreign body .
    OUTPUT:
    
Mild interstitial edema , worsened since the prior exam , superimposed on coarse interstitial lung markings consistent with known chronic mycobacterium avium intracellulare infection and emphysema .