Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with ___ , no significant change is detected . The lungs are well expanded , without focal opacities . The heart appears mildly enlarged , but the cardiomediastinal and hilar contours are otherwise grossly unremarkable . There is mild upper zone redistribution , without overt CHF . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Stable mild cardiomegaly . Possible minimal stable upper zonredistibution . No evidence of pneumonia .