Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There is no focal consolidation , effusion , or edema . Significant enlargement of the cardiac silhouette is stable compared to prior . No acute osseous abnormalities .
    OUTPUT:
    
Significant enlargement of the cardiac silhouette as on prior . This could be due to cardiomegaly or underlying pericardial effusion . No superimposed acute cardiopulmonary process .