Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hyperinflated . Heart size is mildly enlarged but unchanged . The aortic knob is calcified . Mediastinal and hilar contours are unremarkable . Previously noted left upper lobe nodular opacity is not distinctly visualized on the current exam . There is no pulmonary vascular congestion . Streaky bibasilar opacities most likely reflect atelectasis . Blunting of the costophrenic angles posteriorly on the lateral view could reflect trace pleural effusions or pleural thickening . There is no pneumothorax . Multilevel degenerative changes in the thoracic spine are re - demonstrated .
    OUTPUT:
    
No radiographic evidence for pneumonia .