Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior radiograph , there has been resolution of the left pleural effusion . The heart is normal in size and mediastinal contours are normal . Aortic valve replacement and sternal wires are noted . No evidence of pneumonia , pleural effusion , or pneumothorax
    OUTPUT:
    
No acute cardiopulmonary process .