Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior chest radiograph from ___ , lung volumes remain low and there is persistent diffuse interstitial lung disease . No large consolidation identified , however it is difficult to exclude a superimposed acute process . Tracheostomy tube is in unchanged position . A left PICC line terminates in the upper to mid SVC , unchanged in position .
    OUTPUT:
    
Interstitial lung disease . Difficult to exclude a superimposed acute process , however no large consolidation identified .