Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are prominent interstitial markings at the lung bases bilaterally . This may represent developing infiltrate or possibly due to prior pulmonary fibrosis . The cardiomediastinal silhouette and hilar contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Prominent bibasilar interstitial markings , which are nonspecific . Correlate with history of pulmonary fibrosis and comparison with prior imaging studies , if available , would be helpful .