Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal opacity or overt pulmonary edema . There is mild pulmonary vascular congestion . The pleural surfaces are normal . The heart is mildly enlarged , unchanged since ___ . The mediastinal contours are normal .
    OUTPUT:
    
Mild cardiomegaly and pulmonary vascular congestion . No overt pulmonary edema .