Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated and the diaphragms are flattened , suggesting background COPD . The heart is at the upper limits of normal in size . Multiple mediastinal surgical clips are noted . Mild prominence of the pulmonary hila with a tapered appearance raises the question of background pulmonary hypertension . Prominence of the left paratracheal soft tissues is similar to the chest x-ray from ___ and likely accentuated by slight rotation . There is linear atelectasis and / or scarring at left greater than right lung bases . Minimal blunting of the costophrenic angles is noted . No CHF , focal infiltrate , gross effusion , or pneumothorax is detected .
    OUTPUT:
    
1 . Probable background COPD . Prominence of the hila raises the possibility of pulmonary hypertension . 2 . No CHF or focal infiltrate identified . No findings suggestive of an acute pulmonary process . 3 . Minimal linear bibasilar atelectasis / scarring and minimal blunting of the costophrenic angles noted . This appearance is similar , but slightly improved , compared with a chest x-ray from ___