Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate to large left pleural its chin fusion is seen with overlying atelectasis . A pigtail catheter is seen overlying the left lower chest . The right lung is overall hyperinflated . Right greater left biapical pleural thickening is seen . No large pneumothorax is seen . The cardiac silhouette is mildly enlarged . Mediastinal contours are unremarkable .
    OUTPUT:
    
Moderate to large left pleural effusion with overlying atelectasis . A pigtail catheter projects over the left lower hemithorax , posteriorly .