Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains unchanged and within normal limits . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Chronic interstitial opacity in the left lung base is compatible with fibrosis and appears similar . Remainder of the lungs are clear without focal consolidation , pleural effusion or pneumothorax . The lungs are hyperinflated . No acute osseous abnormality is detected .
    OUTPUT:
    
No acute cardiopulmonary abnormality .