Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded , without focal parenchymal opacities . The heart is mildly enlarged , unchanged from prior . The aorta is unfolded , but otherwise the mediastinal contour is unremarkable . Multiple sternotomy wires are intact . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .