Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since chest radiographs obtained in ___ , no significant changes are appreciated . There may be minimal bilateral hyperexpansion of the lungs . Lungs are clear without focal nodules , consolidations , or effusions . Heart size is normal . Cardiomediastinal and hilar silhouettes are normal . Pleural surfaces are normal .
    OUTPUT:
    
No evidence of active or latent TB .