Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . No pleural effusion or pneumothorax present . A right pacer terminates with its leads in the right atrium and right ventricle . Right basal parenchimal scarring is unchanged .
    OUTPUT:
    
No acute intrathoracic process .