Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left upper pigtail pleural drainage catheters unchanged in position . There is no appreciable pneumothorax . The remainder of the exam is unchanged : Persistent left upper lobe collapse responsible for leftward anterior mediastinal shift , otherwise Hyperinflated lungs without focal consolidation . Tiny left pleural effusion is probably not clinically significant .
    OUTPUT:
    
No appreciable pneumothorax .