Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a diffuse bilateral interstitial thickening in both lungs , which might represent interstitial lung disease versus interstitial pulmonary edema . There is no pleural effusion or pneumothorax . Cardiomediastinal and hilar contours are unremarkable .
    OUTPUT:
    
Diffuse interstitial thickening might represent interstitial lung disease , although interstitial pulmonary edema can not be excluded . Comparison with prior study could be helpful to differentiate .