Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . There is redemonstration of midline sternotomy wires and aortic as well as mitral valve replacements . A vascular stent projects over the region of the right subclavian / brachiocephalic vein . There is subsegmental left lower lung atelectasis , as before . Blunting of the left costophrenic angle is consistent with a small left pleural effusion , not significantly changed . There may be a trace right pleural effusion , also not significantly changed . Mild enlargement of the cardiac silhouette is not significantly changed . The mediastinal contours are normal . There is no pneumothorax . Surgical clips are noted in the bilateral upper abdominal quadrants .
    OUTPUT:
    
1 . Small left and possible trace right pleural effusions , not significantly changed . 2 . Minimal left lower lung atelectasis . 3 . Unchanged mild enlargement of the heart .