Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The aortic knob is calcified . Pulmonary vasculature is not engorged . Mediastinal and hilar contours are unremarkable . Lungs are hyperinflated with flattening of the diaphragms and increased retrosternal clear space compatible with underlying COPD . Linear opacities are noted at the lung bases which may reflect areas of scarring and / or atelectasis . Minimal patchy opacity is also noted at the right costophrenic angle , which could reflect an area of infection . Mildly increased interstitial markings are noted within both lungs , which could reflect a chronic interstitial process . No large pleural effusion is demonstrated , and no pneumothorax is seen . Multilevel degenerative changes are present within the thoracic spine .
    OUTPUT:
    
Minimal patchy opacity projecting over the right costophrenic angle may reflect an area of pneumonia . COPD .