Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate cardiomegaly is unchanged . Re - demonstration of postoperative mediastinal silhouette with intact sternotomy wires . Hilar contours are unremarkable . Improved consolidation at the left lung base correlates to scarring on prior CT . Lungs are otherwise clear . No effusion or pneumothorax . Right lower lobe nodule identified on prior CT is not visualized on this study .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Nodule previously identified on CT is not evident on radiography .