Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged and there is pulmonary vascular redistribution . With ill - defined vascularity . There is increased retrocardiac opacity . The prior study demonstrated increased lung markings compatible with chronic lung disease . The current finding suggest acute on top of chronic disease . In particular , the retrocardiac region has increased opacity with ill definition of the left hemidiaphragm
    OUTPUT:
    
Fluid overload superimposed on chronic lung disease . An underlying infectious infiltrate particularly in the left lower lobe can not be excluded .