Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate low lung volumes . Clear lungs . The cardiac silhouette is stably enlarged . Unchanged calcification of the aortic knob and aortic tortuosity . No pneumothorax or pleural effusion .
    OUTPUT:
    
No convincing evidence for pneumonia . Change in read from preliminary to final report discussed with Dr ___ by Dr ___ at 8 :45 am ___ .