Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hyperinflated . The cardiomediastinal silhouette and pulmonary vasculature are unremarkable and unchanged since the prior examinations . There is no consolidation . No pneumothorax or pleural effusion is noted . Chronic changes are seen at the lung bases .
    OUTPUT:
    
No acute intrathoracic abnormality .