Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no pneumothorax . No opacities are concerning for an infectious process . A small left pleural effusion is stable . A left - sided chest tube courses cranially then projects retrocardiacly , terminating in the lower left lobe . The patient is status post median sternotomy . Vascular clips are seen in the mediastinum .
    OUTPUT:
    
No evidence of pneumothorax .