Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior radiograph performed 3 hours prior there is dramatic improvement in the left lung aeration . Left lower lobe collapse and a small pleural effusion persist . Right lower lobe pneumonia is clearing . The cardiac and mediastinal contours are stable . The tracheostomy tube is in unchanged position . Multiple fractures are again identified .
    OUTPUT:
    
Markedly improved aeration of the left lung . Small left pleural effusion and left lower lobe collapse persists . Resolving right lower lobe pneumonia .