Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding chest examination of ___ . The heart size remains normal . No configurational abnormality is identified . Unchanged appearance of thoracic aorta which is mildly widened with prominent aortic arch , but no local contour abnormalities or advanced wall calcifications are present . The pulmonary vasculature is not congested . Similar as on previous examination , the pulmonary vasculature demonstrates an irregular peripheral pattern , coinciding with some flattened diaphragms consistent with COPD . Acute parenchymal infiltrates are not seen . The next previous examination ( ___ ) , plate atelectasis in the right lower lobe and middle lobe area have disappeared . Unchanged appearance of left - sided rib resection ( # 6 ) .
    OUTPUT:
    
Stable chest findings consistent with COPD , but no acute pulmonary infiltrates .