Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears mildly enlarged , the aorta very mildly tortuous . Superior vena cava is perhaps distended to some degree . There is a mild interstitial abnormality suggesting vascular congestion but no focal opacification . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Mild interstitial abnormality , chronicity uncertain although findings could be seen with vascular calcification perhaps superimposed on a more chronic lung disease . Mild cardiomegaly .