Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to chest radiograph dated ___ , this frontal and lateral radiograph is unchanged . The lungs are well expanded and clear . The cardiomediastinal and hilar contours are unremarkable . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
No findings to explain patient 's symptoms . These finings were communicated to the ordering physician per request at the time films were reviewed .