Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate hyperinflated , but clear , lungs . The cardiac size is top normal . The thoracic aorta is unfolded . Slight blunting of the left costophrenic angle may be due to a small amount of scarring rather than pleural effusion . Lobulation of the right hemidiaphragm is present . There is no free air .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .