Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new ET tube with tip 4 .2 cm above the carina . There is right IJ line with tip at the distal SVC . There is diffuse increase in interstitial markings with superimposed patchy alveolar infiltrate . The outside studies shows that some of the alveolar infiltrate has improved over the 4 day interval .
    OUTPUT:
    
Acute on chronic lung disease . The differential diagnosis for this is broad and will require comparison with older films and clinical correlation to assess for chronicity and etiology .