Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally slightly hyperexpanded . Streaky bibasilar opacities likely reflect atelectasis . There is no definite evidence of pneumonia . The heart is exaggerated by AP technique and likely top normal . The mediastinal and hilar contours are unremarkable . There is no large pleural effusion or pneumothorax . Median sternotomy wires appear intact . Anterior cervical fusion hardware is incompletely evaluated on this study .
    OUTPUT:
    
1 . Bibasilar atelectasis , but no convincing evidence of pneumonia . 2 . Mild hyperexpansion of the lung may reflect COPD .