Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Severe end stage changes from sarcoidosis are seen , predominantly in the upper lungs . Increased opacification at the left lung base is impossible to discern pneumonia from different inspiratory effort . There is no pleural effusion or pneumothorax . The cardiac and mediastinal contours are unchanged .
    OUTPUT:
    
Extensive end stage fibrosis from sarcoid limits sensitivity for detecting pneumonia . These findings were discussed with Dr . ___ by Dr . ___ at 8 : 55 on ___ by telephone at the time of interpretation .