Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the CT chest dated ___ , no significant changes are appreciated . There are no suspicious pulmonary nodules or masses . There is a small , linear focus of atelectasis in the right lower lobe . Lungs are otherwise hyperinflated , unchanged since at least ___ , but clear without focal consolidation , pleural effusions , or pleural thickening . Heart size is normal . Cardiomediastinal hilar silhouettes are normal .
    OUTPUT:
    
No radiographic evidence of intrathoracic metastatic disease or other acute cardiopulmonary abnormalities . Unchanged hyperinflation bilaterally may be consistent with chronic obstructive pulmonary disease .