Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated as before . There is pectus excavatum . Biapical pleural thickening is again noted . No focal consolidation is seen . There is no evidence of pneumothorax or pleural effusions . Cardiomediastinal silhouette is slightly enlarged , as before . There is no evidence of pneumoperitoneum .
    OUTPUT:
    
No acute intrathoracic process . Hyperinflated lungs likely secondary to chronic obstructive pulmonary disease .