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 similar study of ___ . Heart size remains normal . The same holds for the thoracic aorta . No mediastinal abnormalities are present . Similar as on the preceding examination , low positioned and flattened diaphragms coincide with emphysematic translucency of the lung bases . Pulmonary vasculature with central prominence and peripheral attenuation typical for rather advanced COPD . Comparison with the next preceding study does not establish any new pulmonary parenchymal infiltrate that might represent an overlying acute pneumonia .
    OUTPUT:
    
Stable chest findings with advanced COPD , but no new acute infiltrate identified .