Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and cardiomediastinal contours are normal . Hilar contours are stable . The hemidiaphragms are relatively flattened , which can be seen with COPD . No focal consolidation , pleural effusion , pneumomediastinum , or pneumothorax .
    OUTPUT:
    
No radiographic findings to suggest pneumomediastinum . No significant interval change .