Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Clips are again noted projecting over the left chest . Chronic left pleural effusion and left basilar atelectasis are unchanged . Right lung is clear . No right pleural effusion . No pneumothorax . No pulmonary vascular congestion . The cardiac , mediastinal and hilar contours are normal .
    OUTPUT:
    
Persistent chronic left pleural effusion . No evidence of pneumonia .