Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Stable cardiomegaly and mild tortuosity of the thoracic aorta in this patient status post previous median sternotomy and coronary bypass surgery . . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are hyperinflated and grossly clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . Compression deformities in the spine are similar to the prior study .
    OUTPUT:
    
No radiographic evidence of pneumonia . Stable radiographic appearance of the chest .