Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Significant left pleural effusion has minimally decreased in size with a new Pleurx catheter projecting at the lung base . There is no pneumothorax . The remaining of the lungs and mediastinum are unremarkable .
    OUTPUT:
    
Slight improvement of the left large pleural effusion after Pleurx placement . There is no pneumothorax .