Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Air - fluid levels are visualized in the right hilar region . There is a persistent moderate right - sided pleural effusion with patchy opacification again seen throughout the right lung , but slightly decreased . Patchy left basilar opacity is similar . There is probably a small effusion on the left side . Degenerative changes are similar along the thoracic spine .
    OUTPUT:
    
Continued slight improvement in right lung aeration . Air-fluid levels in the right hilum of uncertain significance but fistulization or abscess formation are among the possibilities . Evaluation with chest CT , preferably with intravenous contrast if possible , should be considered if fever may relate to this finding .