Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette is normal . Widened mediastinum with loss of the right paratracheal stripe and enlarged hilum represent enlarged lymph nodes , similar in appearance to ___ . The lungs are clear . There is no pleural effusion or pneumothorax . Visualized osseous structures are unremarkable .
    OUTPUT:
    
No evidence of pneumonia . Hilar and mediastinal lymphadenopathy represents known history of sarcoidosis .