Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated . Changes associated with median sternotomy are again noted . There is stable mild cardiomegaly present . There is no evidence of pneumothorax or pleural effusions . No focal opacities are seen to suggest pneumonia . Aortic arch vascular calcifications are seen . There is no evidence of pneumoperitoneum . The osseous structures are unchanged .
    OUTPUT:
    
No acute intrathoracic process .