Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate increased interstitial markings consistent with chronic interstitial lung disease , making assessment of superimposed infection difficult . The cardiomediastinal and hilar contours are unchanged . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Increased interstitial markings consistent with chronic interstitial lung disease . Superimposed infection can not be excluded .