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 dated ___ . The heart size remains normal . No configurational abnormality is present . Unremarkable size of thoracic aorta with few semi-linear calcium deposits in the wall at the level of the arch . The pulmonary vasculature is not congested and there is no evidence of acute or chronic parenchymal infiltrates . As observed on the previous examination , there are relatively low positioned diaphragms that are somewhat flattened , coincide with slightly hypertranslucent lung bases . This finding is suggestive of COPD .
    OUTPUT:
    
Stable chest findings within normal limits . Unchanged mild degree of findings consistent with COPD .