Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show no evidence of pneumonia or pneumothorax at this time . No pleural effusion is present . The pulmonary vasculature is not engorged . The cardiac silhouette is top normal in size , but unchanged . The mediastinal and hilar contours are within normal limits and stable . The aortic knob is partially calcified , with moderate tortuosity of the descending thoracic aorta . S - shaped thoracolumbar scoliosis is again seen on the frontal radiograph .
    OUTPUT:
    
No evidence of pneumonia or pneumothorax at this time .