Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs show hyperinflated lungs which suggest background COPD . The lungs are clear without focal consolidation , pleural effusion or pneumothorax . The pulmonary vasculature is not engorged . The cardiomediastinal silhouette is unchanged from the preceding radiograph . A large hiatal hernia is again seen extending to the level of the carina .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Stable large hiatal hernia .