Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well inflated . Heart size is normal . Rounded density in the central mediastinum may represent a hiatal hernia . No pleural effusion or pneumothorax . No pneumonia .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Rounded density in the central mediastinum could represent a hiatal hernia , however this can be further proven with a lateral view .