Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette and pulmonary vasculature are unchanged and unremarkable . Findings are consistent with emphysema with hyperinflated lungs . No definite focal consolidation is identified . Vague opacity in the left lung base is similar to the prior examination and likely represents atelectasis . Again seen is a hiatal hernia with air in the esophagus , unchanged since the prior examination . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute intrathoracic abnormality .