Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged , slightly enlarged compared to the previous radiograph . The mediastinal contour is unchanged . Enlargement of the hila bilaterally is compatible with underlying pulmonary arterial hypertension . There is no pulmonary edema . Lungs are hyperinflated with marked emphysematous changes again noted . Increased interstitial markings are noted along the periphery and lung bases suggestive of a mild chronic interstitial abnormality . Patchy opacities the lung bases may reflect areas of atelectasis , though infection is not excluded in the correct clinical setting . No large pleural effusion or pneumothorax is seen .
    OUTPUT:
    
1 . Mild cardiomegaly , slightly increased compared to the previous radiograph , without pulmonary edema . 2 . Enlargement of the hila , as seen previously , compatible with history of pulmonary arterial hypertension . 3 . Hyperinflated lungs with marked emphysema and mild chronic interstitial abnormality . Patchy bibasilar airspace opacities may reflect atelectasis , but infection is not excluded in the correct clinical setting .