Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . There is relative narrowing of the transverse dimension of trachea as seen on prior CT , and compatible with COPD . Lungs are hyperinflated consistent with known diagnosis of chronic obstructive pulmonary disease . There is biapical scarring . Right mid lung opacity is likely related to scarring as seen on prior chest CT and is not definitely changed given difference in techniques . There is no new focal consolidation , large pleural effusion or pneumothorax . Previously described 0 .9 cm nodular opacity in the left lung is not clearly visualized on today 's examination .
    OUTPUT:
    
No acute cardiopulmonary process .