Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Following right - sided thoracocentesis , mild - to - moderate right pleural effusion has decreased and mild residual fluid persists . Opacity at the right lung base reflects right basal atelectasis . Left lung is normal . There is no left - sided effusion . There is no evidence of pneumothorax .
    OUTPUT:
    
Following right thoracocentesis moderate right pleural effusion has decreased . Residual small right pleural effusion and right lower lung atelectasis persists . There is no pneumothorax .