Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Changes consistent with known interstitial lung disease appear similar to prior exam . An area of increased opacity is seen in the left lung base and potentially right mid lung laterally ( vs increased increase density due to overlying tissues ) . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is stable from prior exam .
    OUTPUT:
    
Changes consistent with known interstitial lung disease . Areas of increased opacity in the left lung base and potentially right mid lung laterally which may represent superimposed infection .