Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal image of the chest demonstrates interval placement of a right - sided chest tube and reduction of right pleural effusion . There appears to be some gas in the right lower chest , likely represents a pocket of air within a loculated effusion . There is no evidence of pneumothorax or other complications . Cardiac silhouette is unchanged .
    OUTPUT:
    
Improvement in right pleural effusion status post chest tube placement . Otherwise , essentially unchanged chest radiograph from previous imaging .