Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated , suggesting chronic obstructive pulmonary disease . There is blunting of the posterior left costophrenic angle which could be due to a trace pleural effusion , pleural thickening , or atelectasis . No pneumothorax is seen . The cardiac and mediastinal silhouettes are grossly stable .
    OUTPUT:
    
No definite acute cardiopulmonary process . Blunting of the posterior left costophrenic angle may be chronic , could be due to trace pleural effusion , pleural thickening .