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 ___ . The heart size remains unchanged and is within normal limits . Mild widening and elongation of the thoracic aorta with calcium deposits in the wall appears also unchanged . The pulmonary vasculature is not congested . Similar as on the preceding examination , there are low positioned and flattened diaphragms coinciding with a marked irregularity in the vascular distribution in the periphery of both lungs with areas of increased translucency mostly on the lung bases . These findings are grossly unchanged indicative of rather advanced COPD with emphysema . New acute parenchymal infiltrates can not be identified .
    OUTPUT:
    
Stable chest findings since ___ . Findings indicative of advanced COPD but no evidence of new acute infiltrate .