Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No focal consolidation , pleural effusion , or pneumothorax is seen . Mild interstitial abnormality persists . Heart and mediastinal contours are stable . Lung volumes are slightly low . Aortic calcification is again noted . Tracheostomy appears similarly positioned . Median sternotomy wires appear intact . Mediastinal clips suggest prior CABG . A clip is also seen in the region of the gastroesophageal junction , unchanged .
    OUTPUT:
    
Persistent mild interstitial abnormality . No new focal consolidation .