Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax . There is no pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
Normal radiographs of the chest . There is been extensive imaging workup of this patient 's chest pain , all of which has been normal dating back to ___ .