Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Multiple sternal wires and mediastinal clips denote prior cardiac surgery . The heart is mildly enlarged . The hilar and mediastinal contours are within normal limits . There is no pneumothorax , focal consolidation , or pleural effusion . The central pulmonary vessels are normal in caliber . Bibasilar linear densities denote atelectasis . Bridging anterior osteophytosis is unchanged .
    OUTPUT:
    
No acute intrathoracic process .