Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The aortic knob is calcified . Mediastinal and hilar contours are otherwise unremarkable . The pulmonary vasculature is not engorged . No focal consolidation , pleural effusion or pneumothorax is seen . Minimal patchy bibasilar opacities likely reflect atelectasis . Multilevel degenerative changes are present in the thoracic spine . No acute osseous abnormalities detected .
    OUTPUT:
    
No radiographic evidence for pneumonia .