Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy tube projects over the midline , as before . Compared to the prior radiograph from ___ , there is increase in interstitial density of the left mid and lower lung , which takes into account the overlying soft tissue . Cardiomediastinal silhouette is normal . Left chest wall port terminates at the upper aspect of the right atrium . Gaseous distention of loops of large bowel are again seen in the left upper quadrant .
    OUTPUT:
    
Increase in interstitial opacities in the left mid and lower lung may correspond to a viral infection or atypical pneumonia .