Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Generalized chronic interstitial fibrosis and coarse interstitial markings compatible with interstitial lung disease is unchanged . There is no superimposed consolidation suggestive of pneumonia . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are stable . There is no free air beneath the right hemidiaphragm .
    OUTPUT:
    
No superimposed pneumonia in a patient with known chronic interstitial lung disease .