Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hyperexpanded . There is central vascular congestion without frank pulmonary edema . No pleural effusion , pneumothorax or focal airspace consolidation worrisome for pneumonia . Heart is mildly enlarged , which accounting for technique , is unchanged . Mediastinal and hilar contours are unremarkable .
    OUTPUT:
    
Stable , mild cardiomegaly .