Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are symmetrically well expanded without focal consolidation or pneumothorax . Increased opacification projecting over the lower thoracic spine on the lateral view is compatible with a small left pleural effusion . The cardiac silhouette is mildly enlarged , but stable . The mediastinal and hilar contours are within normal limits and unchanged . Mild tortuosity of the thoracic aorta is noted with calcification at the aortic knob . The patient is status post aortic valve replacement with a prosthetic valve unchanged in appearance from the prior study . Median sternotomy wires appear intact .
    OUTPUT:
    
1 . Small left pleural effusion . 2 . No focal consolidation concerning for pneumonia . 3 . Stable cardiomegaly .