Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate clear lungs without effusion or pneumothorax . The cardiac silhouette is normal appearing , with a prominent right cardiophrenic fat pad . The mediastinal contours are unremarkable . Note is made of calcification of the aortic knob . Stable post - kyphoplasty changes of the thoracic spine .
    OUTPUT:
    
No acute chest pathology .