Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable . There is no pleural effusion or pneumothorax . The lungs are hyperexpanded , and extensive fibrotic changes are again seen in the upper lobes , consistent with known history of sarcoidosis . No acute osseous abnormalities are detected .
    OUTPUT:
    
Extensive fibrotic changes in the upper lobes bilaterally . No evidence of pneumonia or other acute process .