Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top - normal . Prominent right paratracheal stripe is chronic , attributable to engorged azygos vein . Cardiomediastinal silhouette and hilar contours are otherwise normal . Lungs are clear . The pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
Clear lungs without evidence of pneumonia , though comparison of CT to radiography in ___ demonstrated focal areas of infection without associated radiographic abnormality . If there is high clinical suspicion , CT can be considered .