Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Unchanged large hiatus hernia with air - fluid level since ___ . Linear opacities at left base represent atelectasis . Stable mild enlargement of the cardiomediastinal silhouette exaggerated by low lung volumes . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
1 . No evidence of aspiration or pneumonia . 2 . Unchanged large hiatus hernia .