Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left heart border is obscured by a moderate left pleural effusion , which has slightly increased in size compared to the prior exam , with stable mild adjacent compressive atelectasis . There has been interval placement of a left - sided pigtail catheter , with the tip seen overlying the effusion . There is no evidence of a pneumothorax . No focal consolidations concerning for infection are identified . The hilar and mediastinal contours are unremarkable .
    OUTPUT:
    
Slight interval increase in the moderate left pleural effusion . Pigtail catheter tip projects over the effusion .