Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The lungs are hyperinflated somewhat flattening the diaphragms , consistent with chronic obstructive pulmonary disease . There is slight blunting of the bilateral posterior costophrenic angles which likely relates to hyperinflation , although very trace pleural effusion is not entirely excluded . There is mild left base atelectasis / scarring . No focal consolidation is seen . The cardiac silhouette is top normal . The aorta is calcified and tortuous .
    OUTPUT:
    
1 . Left base atelectasis / scarring . 2 . COPD . Blunting of the posterior costophrenic angles may relate to hyperinflation , although trace pleural effusion is difficult to exclude .