Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since chest radiographs dated ___ , no appreciable changes are identified . Lungs are fully expanded and clear . Heart size is normal . Cardiomediastinal and hilar silhouettes and pleural surfaces are normal . Incidental note is made of pectus excavatum .
    OUTPUT:
    
No evidence of lung mass or acute cardiopulmonary process .