Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal consolidation , effusion , or pneumothorax . Mild left basilar atelectasis . Mediastinum , hila and pleural surfaces are unremarkable . Heart size is normal . Mild unfolding and tortuosity of the thoracic aorta . Moderate - sized hiatal hernia containing possible retained oral contrast in the dependent portion is noted .
    OUTPUT:
    
1 . No evidence of pneumonia . Mild left basilar atelectasis . 2 . Moderate size hiatal containing probable retained oral contrast .