Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . The known hiatal hernia is seen with residual contrast from upper GI study ___ earlier today . The previously seen thoracic compression fractures are unchanged . The lungs are clear . There is no evidence of pneumonia . The cardiac , mediastinal , hilar , and pleural surfaces are normal . No pleural effusion . No pulmonary nodules .
    OUTPUT:
    
No abnormalities identified to explain patient 's symptoms .