Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged but unchanged . The thoracic aorta is diffusely calcified . The mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Lungs are clear . Blunting of the posterior left costophrenic angle on the lateral view suggests a trace left pleural effusion versus pleural thickening . No pneumothorax is demonstrated . No acute osseous abnormality seen . Remote left sided rib fractures are noted .
    OUTPUT:
    
No radiographic evidence for pneumonia . Possible trace left pleural effusion versus pleural thickening .