Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low with similar pattern of scarring in the left lower lobe as compared with prior CT . Subtle opacity in the right upper lobe is also stable and compatible with scarring as better assessed on prior CT . There is no evidence of pneumonia or CHF . No effusion or pneumothorax . Cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
Stable pattern of scarring in the right upper lobe and left lower lobe compared with prior CT . No acute findings .