Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The position of the right pigtail catheter is unchanged and a right pleural effusion is still present . There is no evidence of a pneumothorax on either side . Small left effusion is present . Compared to the prior chest x-ray of ___ , there has been a mild increase in the size of the right effusion , but unlikely enough to cause acute shortness of breath .
    OUTPUT:
    
No pneumothorax . Slight increase in right effusion .