Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded with fibrotic changes in the lung bases bilaterally which are consistent with findings from previous CT . Though there is blunting within the left costophrenic angle , it most likely represents pleural thickening and scarring with some adjacent atelectasis ; no pleural effusion is identified . The patient is status post median sternotomy with sternotomy wires seen well positioned and aligned along the midline with no evidence of hardware failure . The heart is top normal in size . Aorta is normal in appearance . The hilar silhouettes are unremarkable . Pleural surfaces are unremarkable , and there is no pneumothorax . Osseous structures are unremarkable .
    OUTPUT:
    
Fibrotic changes seen in the lung bases , consistent with findings from previous CT . No evidence of infection or malignancy .