Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy tube terminates in the mid trachea . Patchy peribronchiolar opacities in the middle and lower lobes are decreased from prior examination . ___- mm right perihilar nodule is unchanged . The left lung is clear . There are no pleural effusions or pneumothorax . Cardiac size is normal .
    OUTPUT:
    
1 . Improved right middle and lower lobe opacities , consistent with chronic aspiration . 2 . Right perihilar nodule , better characterized on CT .