Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . There is a diffuse interstitial prominence . No pleural effusion or pneumothorax is seen . No evidence of pulmonary edema .
    OUTPUT:
    
Diffuse , mild interstitial abnormality could represent interstitial lung disease or chronic heart failure . No pulmonary edema .