Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Accounting for differences in lung volume and positioning , study is essentially unchanged from prior . There is no evidence of pneumonia . Diffuse bilateral reticular nodular pattern consistent with chronic fibrosis is seen again . The cardiac and mediastinal silhouette is within normal limits . The pleural surfaces are unremarkable . There is no evidence of pneumothorax . There are no areas of focal consolidation observed .
    OUTPUT:
    
No evidence of pneumonia . Stable chronic fibrosis .