Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hyperexpanded with widening of the AP diameter , similar to the prior , consistent with known diagnosis of COPD . There are no focal airspace opacities to suggest pneumonia . There is mild scarring or atelectasis at the right base . The cardiomediastinal silhouette , hilar contours , and pleural surfaces and are stable . The aorta is calcified and tortuous . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute intrathoracic process .